Air cleaner arrangements; components thereof; and, methods

ABSTRACT

Air cleaner assemblies and components therefor are described and shown. Also methods of assembly and use are described and shown. Projection/receiver arrangements are described, for securing a filter cartridge in place within the housing. Also housing seal arrangements for the filter arrangements being sealed to the housing, and specific housing features and cartridge features are shown.

CROSS-REFERENCE TO RELATED APPLICATIONS

A claim of priority for the present U.S. application is made to U.S. Provisional application 60/815,794 filed Jun. 22, 2006, to the extent appropriate. In addition the complete disclosure of 60/815,794 is incorporated herein by reference.

It is noted that the current application also includes some of the disclosure of U.S. Provisional application 60/760,559 filed Jan. 20, 2006. No claim of priority to the subject of application 60/760,559 is made.

FIELD OF THE DISCLOSURE

The present disclosure concerns air cleaners for use, for example, for cleaning engine combustion air for vehicles and other equipment. The disclosure provides preferred components, assemblies and methods.

BACKGROUND

Gas streams often carry particulate material therein. In many instances it is desirable to remove some or all of the particulate material from the gas flow stream. For example, air intake streams to engines for motorized vehicles or power generation equipment often include particulate material therein. The particulate material, should it reach the internal workings of the mechanisms involved, can cause substantial damage. It is therefore preferred, for such systems, to remove the particulate material from the gas flow upstream of the engine or other equipment involved. A variety of air cleaner arrangements have been developed for particulate removal.

There has been a general trend for the utilization of air cleaner arrangements that utilize, as a media pack, z-filter media constructions. In general z-filter media constructions can be characterized as comprising fluted media sheet material secured to a facing media sheet material, formed into a media pack configuration. Examples of z-filter arrangements are described in PCT Publication WO 97/40918, published Nov. 6, 1997; U.S. Pat. Nos. 6,190,432 and 6,350,291; PCT application US 04/07927, filed Mar. 17, 2004; U.S. Provisional application 60/532,783, filed Dec. 22, 2003; PCT Publication 03/095068, published Nov. 20, 2003; PCT publication WO 04/007054, published Jan. 22, 2004; PCT publication WO 03/084641, published Oct. 16, 2003; and, U.S. Provisional Application 60/543,804, filed Feb. 11, 2004; the complete disclosures of each of these cited references being incorporated herein by reference.

With some arrangements, it has been desired to develop configurations in which the z-filter media is loaded into an air cleaner housing through a side (as opposed to an end) of the housing. Such arrangements are described for example in WO 03/095068, incorporated herein by reference.

Selected components described herein are improvements in such air cleaner arrangements as those described in U.S. Provisional Application 60/567,121, filed Apr. 30, 2004; U.S. Provisional Application 60/604,549, filed Aug. 25, 2004; U.S. Provisional Application 60/649,301, filed Feb. 1, 2005; and PCT Publication WO 05/107924, published Nov. 17, 2005. Each of these references is incorporated herein by reference.

SUMMARY OF THE DISCLOSURE

The present disclosure concerns air cleaners and componentry therefor. A variety of features and component features are described, for air cleaners and their components, including serviceable filter cartridges. Selected features described herein relate to features in an air cleaner housing facilitating installation, alternatively, of different sized primary filter cartridges; and, features of primary filter cartridges that facilitate installation in such housings.

It is noted that not all of the features described herein must be incorporated in an arrangement, for the arrangement to have some selected advantage according to the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary, schematic, perspective view of z-filter media useable in arrangements according to the present disclosure.

FIG. 2 is a schematic, cross-sectional view of a portion of the media depicted in FIG. 1.

FIG. 3 is a schematic view of examples of various corrugated media definitions.

FIG. 4 is a schematic view of a useable process for manufacturing media according to the present disclosure.

FIG. 5 is a cross-sectional view of an optional end dart for media flutes useable in arrangements according to the present disclosure.

FIG. 6 is a top perspective view of an air cleaner assembly having features according to the present disclosure.

FIG. 7 is a side elevational view of the air cleaner depicted in FIG. 6.

FIG. 8 is a top plan view of the air cleaner depicted in FIG. 6, with a modified inlet aperture and outlet aperture arrangement.

FIG. 9 is a perspective view of the air cleaner of FIG. 6, with a modified air outlet arrangement and with an access cover removed for viewing an interior of a housing thereof.

FIG. 10 is a side elevational view of the arrangement of FIG. 9.

FIG. 11 is a top plan view of a first, relatively long, filter cartridge configured for installation in the air cleaner arrangements of FIGS. 1-10; FIG. 11 being from a view point of a top plan view as the element would appear during a step of insertion.

FIG. 12 is a side elevational view of the filter cartridge of FIG. 11; FIG. 12 depicting the cartridge in a side plan view toward a side facing an installer, during installation.

FIG. 13 is a side perspective view of the filter cartridge of FIGS. 11 and 12 installed in an air cleaner housing generally according to FIGS. 6-10 prior to positioning of an access cover on the air cleaner housing.

FIG. 14 is a top plan view generally according to FIG. 13, with a modified inlet cover.

FIG. 15 is a side elevational view of the partial assembly of FIGS. 13 and 14.

FIG. 15A is an enlarged fragmentary view of a portion of FIG. 15.

FIG. 16 is a cross-sectional view of the assembly of FIG. 15, taken with the access cover replaced and generally along line 16-16, FIG. 15.

FIG. 17 is a cross-sectional view analogous to FIG. 16, and taken along line 17-17, FIG. 15, depicting the air cleaner housing with: the filter cartridge removed; the access cover in place; and a modified inlet section and outlet section.

FIG. 18 is a top plan view of a second, shorter, filter cartridge configured for installation in the air cleaner housing of FIGS. 6-10; the view of FIG. 18 being a top plan view of the cartridge oriented for a step of installation.

FIG. 19 is a side elevational view of the cartridge depicted in FIG. 18; FIG. 19 depicting a view point toward an installer.

FIG. 20 is a side perspective view depicting the cartridge of FIGS. 18 and 19 installed in a housing generally in accord with FIGS. 6-10 but without an access cover on the housing.

FIG. 21 is a top plan view of the assembly of FIG. 20, with a modified inlet and without an access cover in place.

FIG. 22 is a side elevational view of the assemblies of FIGS. 20-21, with an access cover in place.

FIG. 23 is an enlarged fragmentary view of a portion of FIG. 20.

FIG. 24 is a cross-sectional view of the assembly of FIGS. 20-22, depicted with an access cover in position and from a cross-sectional view generally in accord with line 16-16, FIG. 15, but depicting the assembly with the shorter filter cartridge of FIGS. 19 and 20, in place.

FIG. 25 is a schematic depiction of a modification in the air cleaner of FIG. 6, for a first side inlet.

FIG. 26 is a schematic view of an assembly generally in accord with FIG. 25, with a second modified side inlet.

FIG. 27 is a schematic view of an air cleaner according to FIG. 7 depicted within an engine compartment of a vehicle.

FIG. 28 is an enlarged fragmentary cross-sectional view of a portion of a filter cartridge useable in arrangements according to the present disclosure.

FIG. 29 is a cross-sectional view analogous to FIG. 28, depicting a first alternate seal arrangement.

FIG. 30 is a fragmentary cross-sectional view depicting a second alternate seal arrangement.

FIG. 31 is an enlarged fragmentary cross-sectional view depicting a third alternate seal arrangement.

FIG. 32 is a view analogous to FIG. 13, but depicting an alternate dual inlet.

FIG. 33 is a schematic top plan view analogous to FIG. 11, of an alternate filter cartridge installable in a housing incorporating selected principles described herein.

FIG. 34 is a schematic side elevational view of the cartridge of FIG. 33.

FIG. 35 is an outlet end elevational view of the cartridge depicted in FIGS. 33 and 34.

FIG. 36 is an inlet end elevational view of the cartridge depicted in FIGS. 33-35.

FIG. 37 is a schematic side cross-sectional view analogous to FIG. 10 depicting a housing for receipt of the cartridge of FIGS. 33-36, with an access cover removed; in FIG. 37 the air cleaner housing depicted being shown with alternate inlet and outlet configurations to those shown in FIG. 10.

FIG. 38 is a schematic view analogous to FIG. 37, with the cartridge of FIG. 33-36 installed and also depicted in cross-section.

FIG. 39 is an enlarged fragmentary cross-sectional view of a portion of FIG. 38, taken along line 39-39 thereof.

FIG. 40 is an enlarged, schematic, fragmentary view of a portion of FIG. 39.

FIG. 41 is an enlarged, schematic, fragmentary cross-sectional view of a portion of FIG. 38.

DETAILED DESCRIPTION I. Z-Filter Media Configurations, Generally

Fluted filter media can be used to provide fluid filter constructions in a variety of manners. One well known manner is as a z-filter construction. The term “z-filter construction” as used herein, is meant to refer to a filter construction in which individual ones of corrugated, folded or otherwise formed filter flutes are used to define sets of longitudinal, filter flutes for fluid flow through the media; the fluid flowing along the length of the flutes between opposite inlet and outlet flow ends (or flow faces) of the media. Some examples of z-filter media are provided in U.S. Pat. Nos. 5,820,646; 5,772,883; 5,902,364; 5,792,247; 5,895,574; 6,210,469; 6,190,432; 6,350,296; 6,179,890; 6,235,195; Des. 399,944; Des. 428,128; Des. 396,098; Des. 398,046; and, Des. 437,401; each of these fifteen cited references being incorporated herein by reference.

One type of z-filter media, utilizes two specific media components joined together, to form the media construction. The two components are: (1) a fluted (typically corrugated) media sheet; and, (2) a facing media sheet. The facing media sheet is typically non-corrugated, however it can be corrugated, for example perpendicularly to the flute direction as described in U.S. provisional 60/543,804, filed Feb. 11, 2004, incorporated herein by reference.

The fluted (typically corrugated) media sheet and the facing media sheet, together, are used to define media having parallel inlet and outlet flutes. In some instances, the fluted sheet and non-fluted sheet are secured together and are then coiled to form a z-filter media construction. Such arrangements are described, for example, in U.S. Pat. Nos. 6,235,195 and 6,179,890, each of which is incorporated herein by reference. In certain other arrangements, some non-coiled sections of fluted media secured to flat media, are stacked on one another, to create a filter construction. An example of this is described in FIG. 11 of 5,820,646, incorporated herein by reference.

For specific examples described herein below, coiled arrangements are depicted, although many of the principles can be applied with stacked arrangements.

Typically, coiling of the fluted sheet/facing sheet combination around itself, to create a coiled media pack, is conducted with the facing sheet directed outwardly. Some techniques for coiling are described in U.S. provisional application 60/467,521, filed May 2, 2003 and PCT Application US 04/07927, filed Mar. 17, 2004, each of which is incorporated herein by reference. The resulting coiled arrangement generally has, as the outer surface of the media pack, a portion of the facing sheet, as a result.

The term “corrugated” used herein to refer to structure in media, is meant to refer to a flute structure resulting from passing the media between two corrugation rollers, i.e., into a nip or bite between two rollers, each of which has surface features appropriate to cause a corrugation affect in the resulting media. The term “corrugation” is not meant to refer to flutes that are formed by techniques not involving passage of media into a bite between corrugation rollers. However, the term “corrugated” is meant to apply even if the media is further modified or deformed after corrugation, for example by the folding techniques described in PCT WO 04/007054, published Jan. 22, 2004, incorporated herein by reference.

Corrugated media is a specific form of fluted media. Fluted media is media which has individual flutes (for example formed by corrugating or folding) extending thereacross.

Serviceable filter element or filter cartridge configurations utilizing z-filter media are sometimes referred to as “straight through flow configurations” or by variants thereof. In general, in this context what is meant is that the serviceable filter elements generally have an inlet flow end (or face) and an opposite exit flow end (or face), with flow entering and exiting the filter cartridge in generally the same straight through direction. (The term “straight through flow configuration” disregards, for this definition, air flow that passes out of the media pack through the outermost wrap of facing media.) The term “serviceable” in this context is meant to refer to a media containing filter cartridge that is periodically removed and replaced from a corresponding air cleaner. In some instances, each of the inlet flow end and outlet flow end will be generally flat or planar, with the two parallel to one another. However, variations from this, for example non-planar faces are possible.

A straight through flow configuration (especially for a coiled media pack) is, for example, in contrast to serviceable filter cartridges such as cylindrical pleated filter cartridges of the type shown in U.S. Pat. No. 6,039,778, incorporated herein by reference, in which the flow generally makes a turn as its passes through the serviceable cartridge. That is, in a U.S. Pat. No. 6,039,778 filter, the flow enters the cylindrical filter cartridge through a cylindrical side, and then turns to exit through an end face (in forward-flow systems). In a typical reverse-flow system, the flow enters the serviceable cylindrical cartridge through an end face and then turns to exit through a side of the cylindrical filter cartridge. An example of such a reverse-flow system is shown in U.S. Pat. No. 5,613,992, incorporated by reference herein.

The term “z-filter media construction” and variants thereof as used herein, without more, is meant to refer to any or all of: a web of corrugated or otherwise fluted media secured to (facing) media with appropriate sealing to inhibit air flow from one flow face to another without filtering passage through the filter media; and/or, such a media coiled or otherwise constructed or formed into a three dimensional network of flutes; and/or, a filter construction including such media. In many arrangements, the z-filter media constructions configured for the formation of a network of inlet and outlet flutes, inlet flutes being open at a region adjacent an inlet face and being closed at a region adjacent an outlet face; and, outlet flutes being closed adjacent an inlet face and being open adjacent an outlet face. However, alternative z-filter media arrangements are possible, see for example US 2006/0091084 A1, published May 4, 2006, incorporated herein by reference; also comprising flutes extending between opposite flow faces, with a seal arrangement to prevent flow of unfiltered air through the media pack.

In FIG. 1 herein, an example of media 1 useable in z-filter media is shown. The media 1 is formed from a fluted (corrugated) sheet 3 and a facing sheet 4.

In general, the corrugated sheet 3, FIG. 1 is of a type generally characterized herein as having a regular, curved, wave pattern of flutes or corrugations 7. The term “wave pattern” in this context, is meant to refer to a flute or corrugated pattern of alternating troughs 7 b and ridges 7 a. The term “regular” in this context is meant to refer to the fact that the pairs of troughs and ridges (7 b, 7 a) alternate with generally the same repeating corrugation (or flute) shape and size. (Also, typically in a regular configuration each trough 7 b is substantially an inverse of each ridge 7 a.) The term “regular” is thus meant to indicate that the corrugation (or flute) pattern comprises troughs and ridges with each pair (comprising an adjacent trough and ridge) repeating, without substantial modification in size and shape of the corrugations along at least 70% of the length of the flutes. The term “substantial” in this context, refers to a modification resulting from a change in the process or form used to create the corrugated or fluted sheet, as opposed to minor variations from the fact that the media sheet 3 is flexible. With respect to the characterization of a repeating pattern, it is not meant that in any given filter construction, an equal number of ridges and troughs is necessarily present. The media 1 could be terminated, for example, between a pair comprising a ridge and a trough, or partially along a pair comprising a ridge and a trough. (For example, in FIG. 1 the media 1 depicted in fragmentary has eight complete ridges 7 a and seven complete troughs 7 b.) Also, the opposite flute ends (ends of the troughs and ridges) may vary from one another. Such variations in ends are disregarded in these definitions, unless specifically stated. That is, variations in the ends of flutes are intended to be covered by the above definitions.

In the context of the characterization of a “curved” wave pattern of corrugations, the term “curved” is meant to refer to a corrugation pattern that is not the result of a folded or creased shape provided to the media, but rather the apex 7 a of each ridge and the bottom 7 b of each trough is formed along a radiused curve. Although alternatives are possible, a typical radius for such z-filter media would be at least 0.25 mm and typically would be not more than 3 mm. (Media that is not curved, by the above definition, can also be useable.)

An additional characteristic of the particular regular, curved, wave pattern depicted in FIG. 1, for the corrugated sheet 3, is that at approximately a midpoint 30 between each trough and each adjacent ridge, along most of the length of the flutes 7, is located a transition region where the curvature inverts. For example, viewing back side or face 3 a, FIG. 1, trough 7 b is a concave region, and ridge 7 a is a convex region. Of course when viewed toward front side or face 3 b, trough 7 b of side 3 a forms a ridge; and, ridge 7 a of face 3 a, forms a trough. (In some instances, region 30 can be a straight segment, instead of a point, with curvature inverting at ends of the segment 30.)

A characteristic of the particular regular, curved, wave pattern corrugated sheet 3 shown in FIG. 1, is that the individual corrugations are generally straight. By “straight” in this context, it is meant that through at least 70% (typically at least 80%) of the length between edges 8 and 9, the ridges 7 a and troughs 7 b do not change substantially in cross-section. The term “straight” in reference to corrugation pattern shown in FIG. 1, in part distinguishes the pattern from the tapered flutes of corrugated media described in FIG. 1 of WO 97/40918 and PCT Publication WO 03/47722, published Jun. 12, 2003, incorporated herein by reference. The tapered flutes of FIG. 1 of WO 97/40918, for example, would be a curved wave pattern, but not a “regular” pattern, or a pattern of straight flutes, as the terms are used herein.

Referring to the present FIG. 1 and as referenced above, the media 1 has first and second opposite edges 8 and 9. When the media 1 is coiled and formed into a media pack, in general edge 9 will form an inlet end for the media pack and edge 8 an outlet end, although an opposite orientation is possible.

In the example shown, adjacent edge 8 is provided sealant, in this instance in the form of a sealant bead 10, sealing the corrugated (fluted) sheet 3 and the facing sheet 4 together. Bead 10 will sometimes be referred to as a “single facer” bead, since it is a bead between the corrugated sheet 3 and facing sheet 4, which forms the single facer or media strip 1. Sealant bead 10 seals closed individual flutes 11 adjacent edge 8, to passage of air therefrom.

In the example shown, adjacent edge 9, is provided sealant, in this instance in the form of a seal bead 14. Seal bead 14 generally closes flutes 15 to passage of unfiltered fluid therein, adjacent edge 9. Bead 14 would typically be applied as the media 1 is coiled about itself, with the corrugated sheet 3 directed to the inside. Thus, bead 14 will form a seal between a back side 17 of facing sheet 4, and side 18 of the corrugated sheet 3. The bead 14 will sometimes be referred to as a “winding bead” since it is typically applied, as the strip 1 is coiled into a coiled media pack. If the media 1 is cut in strips and stacked, instead of coiled, bead 14 would be a “stacking bead.”

Referring to FIG. 1, once the media 1 is incorporated into a media pack, for example by coiling or stacking, it can be operated as follows. First, air in the direction of arrows 12, would enter open flutes 11 adjacent end 9. Due to the closure at end 8, by bead 10, the air would pass through the media shown by arrows 13. It could then exit the media pack, by passage through open ends 15 a of the flutes 15, adjacent end 8 of the media pack. Of course operation could be conducted with air flow in the opposite direction.

In more general terms, z-filter media comprises fluted filter media secured to facing filter media, and configured in a media pack of flutes extending between first and second opposite flow faces. A sealant arrangement is provided within the media pack, to ensure that air entering flutes at a first upstream edge cannot exit the media pack from a downstream edge, without filtering passage through the media.

For the particular arrangement shown herein in FIG. 1, the parallel corrugations 7 a, 7 b are generally straight completely across the media, from edge 8 to edge 9. Straight flutes or corrugations can be deformed or folded at selected locations, especially at ends. Modifications at flute ends for closure are generally disregarded in the above definitions of “regular,” “curved” and “wave pattern.”

Z-filter constructions which do not utilize straight, regular curved wave pattern corrugation (flute) shapes are known. For example in Yamada et al. U.S. Pat. No. 5,562,825 corrugation patterns which utilize somewhat semicircular (in cross section) inlet flutes adjacent narrow V-shaped (with curved sides) exit flutes are shown (see FIGS. 1 and 3, of U.S. Pat. No. 5,562,825). In Matsumoto, et al. U.S. Pat. No. 5,049,326 circular (in cross-section) or tubular flutes defined by one sheet having half tubes attached to another sheet having half tubes, with flat regions between the resulting parallel, straight, flutes are shown, see FIG. 2 of Matsumoto '326. In Ishii, et al. U.S. Pat. No. 4,925,561 (FIG. 1) flutes folded to have a rectangular cross section are shown, in which the flutes taper along their lengths. In WO 97/40918 (FIG. 1), flutes or parallel corrugations which have a curved, wave patterns (from adjacent curved convex and concave troughs) but which taper along their lengths (and thus are not straight) are shown. Also, in WO 97/40918 flutes which have curved wave patterns, but with different sized ridges and troughs, are shown.

In general, the filter media is a relatively flexible material, typically a non-woven fibrous material (of cellulose fibers, synthetic fibers or both) often including a resin therein, sometimes treated with additional materials. Thus, it can be conformed or configured into the various corrugated patterns, without unacceptable media damage. Also, it can be readily coiled or otherwise configured for use, again without unacceptable media damage. Of course, it must be of a nature such that it will maintain the required corrugated configuration, during use.

In the corrugation process, an inelastic deformation is caused to the media. This prevents the media from returning to its original shape. However, once the tension is released the flute or corrugations will tend to spring back, recovering only a portion of the stretch and bending that has occurred. The facing sheet is sometimes tacked to the fluted sheet, to inhibit this spring back in the corrugated sheet.

Also, typically, the media contains a resin. During the corrugation process, the media can be heated to above the glass transition point of the resin. When the resin then cools, it will help to maintain the fluted shapes.

The media of the corrugated sheet 3 facing sheet 4 or both, can be provided with a fine fiber material on one or both sides thereof, for example in accord with U.S. Pat. No. 6,673,136, incorporated herein by reference.

An issue with respect to z-filter constructions relates to closing of the individual flute ends. Typically a sealant or adhesive is provided, to accomplish the closure. As is apparent from the discussion above, in typical z-filter media, especially that which uses straight flutes as opposed to tapered flutes, large sealant surface areas (and volume) at both the upstream end and the downstream end are needed. High quality seals at these locations are critical to proper operation of the media structure that results. The high sealant volume and area, creates issues with respect to this.

Still referring to FIG. 1, at 20 tack beads are shown positioned between the corrugated sheet 3 and facing sheet 4, securing the two together. The tack beads can be for example, discontinuous lines of adhesive. The tack beads can also be points in which the media sheets are welded together.

From the above, it will be apparent that the corrugated sheet 3 is typically not secured continuously to the facing sheet, along the troughs or ridges where the two adjoin. Thus, air can flow between adjacent inlet flutes, and alternately between the adjacent outlet flutes, without passage through the media. However air which has entered in inlet flute cannot exit from an outlet flute, without passing through at least one sheet of media, with filtering.

Attention is now directed to FIG. 2, in which a z-filter media construction 40 utilizing a fluted (in this instance regular, curved, wave pattern corrugated) sheet 43, and a non-corrugated flat, facing, sheet 44, is depicted. The distance D1, between points 50 and 51, defines the extension of flat media 44 in region 52 underneath a given corrugated flute 53. The length D2 of the arcuate media for the corrugated flute 53, over the same distance D1 is of course larger than D1, due to the shape of the corrugated flute 53. For a typical regular shaped media used in fluted filter applications, the linear length D2 of the media 53 between points 50 and 51 will generally be at least 1.2 times D1. Typically, D2 would be within a range of 1.2-2.0, inclusive. One particularly convenient arrangement for air filters has a configuration in which D2 is about 1.25-1.35×D1. Such media has, for example, been used commercially in Donaldson Powercore™ Z-filter arrangements. Herein the ratio D2/D1 will sometimes be characterized as the flute/flat ratio or media draw for the corrugated media.

In the corrugated cardboard industry, various standard flutes have been defined. For example the standard E flute, standard X flute, standard B flute, standard C flute and standard A flute. FIG. 3, attached, in combination with Table A below provides definitions of these flutes.

Donaldson Company, Inc., (DCI) the assignee of the present disclosure, has used variations of the standard A and standard B flutes, in a variety of z-filter arrangements. These flutes are also defined in Table A and FIG. 3.

TABLE A (Flute definitions for FIG. 3) DCI A Flute: Flute/flat = 1.52:1; The Radii (R) are as follows: R1000 = .0675 inch (1.715 mm); R1001 = .0581 inch (1.476 mm); R1002 = .0575 inch (1.461 mm); R1003 = .0681 inch (1.730 mm); DCI B Flute: Flute/flat = 1.32:1; The Radii (R) are as follows: R1004 = .0600 inch (1.524 mm); R1005 = .0520 inch (1.321 mm); R1006 = .0500 inch (1.270 mm); R1007 = .0620 inch (1.575 mm); Std. E Flute: Flute/flat = 1.24:1; The Radii (R) are as follows: R1008 = .0200 inch (.508 mm); R1009 = .0300 inch (.762 mm); R1010 = .0100 inch (.254 mm); R1011 = .0400 inch (1.016 mm); Std. X Flute: Flute/flat = 1.29:1; The Radii (R) are as follows: R1012 = .0250 inch (.635 mm); R1013 = .0150 inch (.381 mm); Std. B Flute: Flute/flat = 1.29:1; The Radii (R) are as follows: R1014 = .0410 inch (1.041 mm); R1015 = .0310 inch (.7874 mm); R1016 = .0310 inch (.7874 mm); Std. C Flute: Flute/flat = 1.46:1; The Radii (R) are as follows: R1017 = .0720 inch (1.829 mm); R1018 = .0620 inch (1.575 mm); Std. A Flute: Flute/flat = 1.53:1; The Radii (R) are as follows: R1019 = .0720 inch (1.829 mm); R1020 = .0620 inch (1.575 mm).

Of course other, standard, flutes definitions from the corrugated box industry are known.

In general, standard flute configurations from the corrugated box industry can be used to define corrugation shapes or approximate corrugation shapes for corrugated media. Comparisons above between the DCI A flute and DCI B flute, and the corrugation industry standard A and standard B flutes, indicate some convenient variations.

II. Manufacture of Coiled Media Configurations Using Fluted Media, Generally

In FIG. 4, one example of a manufacturing process for making a media strip corresponding to strip 1, FIG. 1 is shown. In general, facing sheet 64 and the fluted (corrugated) sheet 66 having flutes 68 are brought together to form a media web 69, with an adhesive bead located therebetween at 70. The adhesive bead 70 will form a single facer bead 10, FIG. 1. An optional darting process occurs at station 71 to form center darted section 72 located mid-web. The z-filter media or Z-media strip 74 can be cut or slit at 75 along the bead 70 to create two pieces 76, 77 of z-filter media 74, each of which has an edge with a strip of sealant (single facer bead) extending between the corrugating and facing sheet. Of course, if the optional darting process is used, the edge with a strip of sealant (single facer bead) would also have a set of flutes darted at this location.

Techniques for conducting a process as characterized with respect to FIG. 4 are described in PCT WO 04/007054, published Jan. 22, 2004 incorporated herein by reference.

Still in reference to FIG. 4, before the z-filter media 74 is put through the darting station 71 and eventually slit at 75, it must be formed. In the schematic shown in FIG. 4, this is done by passing a sheet of media 92 through a pair of corrugation rollers 94, 95. In the schematic shown in FIG. 4, the sheet of media 92 is unrolled from a roll 96, wound around tension rollers 98, and then passed through a nip or bite 102 between the corrugation rollers 94, 95. The corrugation rollers 94, 95 have teeth 104 that will give the general desired shape of the corrugations after the flat sheet 92 passes through the nip 102. After passing through the nip 102, the sheet 92 becomes corrugated across the machine direction and is referenced at 66 as the corrugated sheet. The corrugated sheet 66 is then secured to facing sheet 64. (The corrugation process may involve heating the media, in some instances.)

Still in reference to FIG. 4, the process also shows the facing sheet 64 being routed to the darting process station 71. The facing sheet 64 is depicted as being stored on a roll 106 and then directed to the corrugated sheet 66 to form the Z-media 74. The corrugated sheet 66 and the facing sheet 64 would typically be secured together by adhesive or by other means (for example by sonic welding).

Referring to FIG. 4, an adhesive line 70 is shown used, to secure corrugated sheet 66 and facing sheet 64 together, as the sealant bead. Alternatively, the sealant bead for forming the facing bead could be applied as shown as 70 a. If the sealant is applied at 70 a, it may be desirable to put a gap in the corrugation roller 95, and possibly in both corrugation rollers 94, 95, to accommodate the bead 70 a.

Of course the equipment of FIG. 4 can be modified to provide for the tack beads 20, if desired.

The type of corrugation provided to the corrugated media is a matter of choice, and will be dictated by the corrugation or corrugation teeth of the corrugation rollers 94, 95. One useful corrugation pattern will be a regular curved wave pattern corrugation, of straight flutes, as defined herein above. A typical regular curved wave pattern used, would be one in which the distance D2, as defined above, in a corrugated pattern is at least 1.2 times the distance D1 as defined above. In example applications, typically D2=1.25−1.35×D1, although alternatives are possible. In some instances the techniques may be applied with curved wave patterns that are not “regular,” including, for example, ones that do not use straight flutes. Also, variations from the curved wave patterns shown, are possible.

As described, the process shown in FIG. 4 can be used to create the center darted section 72. FIG. 5 shows, in cross-section, one of the flutes 68 after darting and slitting.

A fold arrangement 118 can be seen to form a darted flute 120 with four creases 121 a, 121 b, 121 c, 121 d. The fold arrangement 118 includes a flat first layer or portion 122 that is secured to the facing sheet 64. A second layer or portion 124 is shown pressed against the first layer or portion 122. The second layer or portion 124 is preferably formed from folding opposite outer ends 126, 127 of the first layer or portion 122.

Still referring to FIG. 5, two of the folds or creases 121 a, 121 b will generally be referred to herein as “upper, inwardly directed” folds or creases. The term “upper” in this context is meant to indicate that the creases lie on an upper portion of the entire fold 120, when the fold 120 is viewed in the orientation of FIG. 5. The term “inwardly directed” is meant to refer to the fact that the fold line or crease line of each crease 121 a, 121 b, is directed toward the other.

In FIG. 5, creases 121 c, 121 d, will generally be referred to herein as “lower, outwardly directed” creases. The term “lower” in this context refers to the fact that the creases 121 c, 121 d are not located on the top as are creases 121 a, 121 b, in the orientation of FIG. 5. The term “outwardly directed” is meant to indicate that the fold lines of the creases 121 c, 121 d are directed away from one another.

The terms “upper” and “lower” as used in this context are meant specifically to refer to the fold 120, when viewed from the orientation of FIG. 5. That is, they are not meant to be otherwise indicative of direction when the fold 120 is oriented in an actual product for use.

Based upon these characterizations and review of FIG. 5, it can be seen that a preferred regular fold arrangement 118 according to FIG. 5 in this disclosure is one which includes at least two “upper, inwardly directed, creases.” These inwardly directed creases are unique and help provide an overall arrangement in which the folding does not cause a significant encroachment on adjacent flutes.

A third layer or portion 128 can also be seen pressed against the second layer or portion 124. The third layer or portion 128 is formed by folding from opposite inner ends 130, 131 of the third layer 128.

Another way of viewing the fold arrangement 118 is in reference to the geometry of alternating ridges and troughs of the corrugated sheet 66. The first layer or portion 122 is formed from an inverted ridge. The second layer or portion 124 corresponds to a double peak (after inverting the ridge) that is folded toward, and in preferred arrangements, folded against the inverted ridge.

Techniques for providing the optional dart described in connection with FIG. 5, in a preferred manner, are described in PCT WO 04/007054, incorporated herein by reference. Techniques for coiling the media, with application of the winding bead, are described in PCT application US 04/07927, filed Mar. 17, 2004 and incorporated herein by reference.

Techniques described herein are particularly well adapted for use in media packs that result from coiling a single sheet comprising a corrugated sheet/facing sheet combination, i.e., a “single facer” strip. Certain of the techniques can be applied with arrangements that, instead of being formed by coiling, are formed from a plurality of strips of single facer.

Coiled media pack arrangements can be provided with a variety of peripheral perimeter definitions. In this context the term “peripheral, perimeter definition” and variants thereof, is meant to refer to the outside perimeter shape defined, looking at either the inlet end or the outlet end of the media pack. Typical shapes are circular as described in PCT WO 04/007054 and PCT application US 04/07927. Other useable shapes are obround, some examples of obround being oval shape. In general oval shapes have opposite curved ends attached by a pair of opposite sides. In some oval shapes, the opposite sides are also curved. In other oval shapes, sometimes called racetrack shapes, the opposite sides are generally straight. Racetrack shapes are described for example in PCT WO 04/007054 and PCT application US 04/07927.

Another way of describing the peripheral or perimeter shape is by defining the perimeter resulting from taking a cross-section through the media pack in a direction orthogonal to the winding access of the coil.

Opposite flow ends or flow faces of the media pack can be provided with a variety of different definitions. In many arrangements, the ends are generally flat and perpendicular to one another. In other arrangements, the end faces include tapered, coiled, stepped portions which can either be defined to project axially outwardly from an axial end of the side wall of the media pack; or, to project axially inwardly from an end of the side wall of the media pack.

The flute seals (for example from the single facer bead, winding bead or stacking bead) can be formed from a variety of materials. In various ones of the cited and incorporated references, hot melt or polyurethane seals are described as possible for various applications.

III. Improved Air Cleaner Arrangements Utilizing Z-Filter Media

A. General Air Cleaner Features.

The reference numeral 200, FIG. 6, generally depicts an air cleaner according to the present disclosure. The air cleaner 200 comprises a housing 201 having an inlet section 202, an outlet section 203 and a central region 205 positioned therebetween. The central region 205 includes a removable access cover 206.

In general, the central region 205 defines an installation and receiving space for a primary air filter cartridge or cartridge arrangement, which is serviceable, removable and replaceable. During air cleaner use, air to be filtered: (a) enters the air cleaner 200 through inlet arrangement 210 in inlet section 202; (b) is directed through a primary filter cartridge received within central region 205; and, then, (c) the resulting filtered air is passed into outlet section 203, from which it passes through outlet arrangement 211 into appropriate ductwork into an engine air intake.

The particular air cleaner 200 depicted, would typically be manufactured in modular pieces comprising: the inlet section 202; the outlet section 203; and, the central section 205, comprising base 214 and separable access cover 206. In a typical approach, the parts 202, 203, 206 and 214 can be molded from plastic utilizing a variety of molding techniques. However, alternate materials and approaches to construction can be used with the principles described herein.

Herein the base 214 will sometimes be referred to as a “primary filter cartridge receiving section.” The term “primary filter cartridge” in this context, is meant to refer to a serviceable filter cartridge including z-filter media in accord with the general descriptions above, positioned within housing 201 during use. The term “primary filter cartridge” is not meant to include within its scope, any separate safety filters that may be positioned within the housing 201. The term “primary filter cartridge receiving section” is meant to refer to the portion of base 214, in which the primary filter cartridge is positioned, during installation. It is noted that in some instances portions of the primary filter cartridge, during installation, can project out of the primary filter cartridge receiving section 214, for example into cover 206 and as described below, portions of a seal arrangement on the primary filter cartridge may project into the outlet section 203.

As a result of the modular construction, the air cleaner 200 of FIG. 6 can be provided with a variety of options including, for example: mounting of a modified outlet section 203 for example configured such that outlet arrangement 211 is a tube that points in an opposite direction from that shown in FIG. 6; and, replacement of inlet section 202 with an alternate inlet section modified, for example, to receive air flow from an alternate direction and/or to have a different inlet configuration. Examples of these possibilities are discussed briefly herein below and are shown in various drawings.

In a typical arrangement, once the modular housing assembly 201 is created, the inlet section 202 and outlet section 203 would not be removed from the base 214. Thus, typically these components will typically be provided with an interference fit or be sonically welded or otherwise secured together.

The access cover 206 is configured to removable from a remainder of housing 201, for service access to an interior of the housing 201. In the example shown, the access cover 206 is secured in place by over center latches 216. Such latches 216 would typically be manufactured from metal wire and then would be mounted on latch mounts 217 molded into the access cover 206.

Still referring to FIG. 6, it is noted that for the particular air cleaner 200 depicted, inlet 210 is provided with a flexible bellows 220. The bellows 220 is an option, and is configured to be engaged by a hood of a vehicle, such as a truck, being closed over the air cleaner 200, such that an inlet duct arrangement built into the hood engages the bellows 220 for directing air to inlet 210. An example is shown schematically in FIG. 27, discussed below.

The air cleaner 200 depicted in FIGS. 6 and 27, is depicted in an orientation it would typically have when installed, typically on top of an engine block and under the hood of a truck. That is, although alternatives are possible, in many uses, cover 206 would be removable laterally from a side of housing 201, instead of being lifted upwardly when removed.

Attention is now directed to FIG. 7. In FIG. 7 air cleaner 200 is depicted in a side elevational view; the view being toward access cover 206. It is noted that in FIG. 7 the outlet section 203 is depicted mounted rotated 180° relative to FIG. 6, such that the outlet arrangement 211 (not viewable in FIG. 7) points away from the viewer. This is indicative of certain options provided by the modular construction, as suggested above.

Referring still to FIG. 7, at 225 mounting legs or pads are provided, for securing the air cleaner 200 in position, or within equipment such as a vehicle. It is noted that mounting pads can be provided at various locations on the housing 201, to allow for alternate orientations of the mounting of the air cleaner 200. The mounting pads 225 will typically be positioned on base 214 (FIG. 6) of central section 205, for convenience and modular assembly.

For the example shown the mounting pads 225 are directed at an angle of about 90° from a direction of removal of cover 206, although alternatives are possible. This example, then, is consistent with a depicted orientation in which the cover 206 is removed laterally from the air cleaner housing 201, as opposed to being lifted directly upwardly, during servicing. Alternative orientations of mounting can be used with principles described herein, however.

Air cleaners that are in accord with the descriptions herein can be manufactured in a variety of sizes, for use with a variety of equipment. Typically the air cleaners will be used with mobile equipment such as trucks, and will be installed under a hood arrangement of the trucks. In FIG. 7 some example dimensions are indicated, for an example of such application. Of course variations from these dimensions can be used for alternate applications. The example dimensions of FIG. 7 are as follows: AA=744.3 mm; AB=336.8 mm; AC=330.1 mm.

In FIG. 8 a top plan view of the air cleaner 200 is depicted. It is noted that in FIG. 8 the outlet section 203 is consistent with the outlet section of FIG. 7, and 180° reversed from the outlet section as depicted in FIG. 6. It is also noted that in: FIG. 8 an alternate inlet section 202, with inlet arrangement 227 is depicted. This again demonstrates the convenience of the modular construction. It is noted that some different, example, dimensions are provided in the example of FIG. 8, as follows: BA=744.9 mm; BB=304.6 mm; BC=491.4 mm.

In FIG. 9 air cleaner 200 is depicted with: access cover 206 removed; and, without any installed filter cartridges. Thus interior 201 i of housing 201 is viewable.

As will be understood from discussion with respect to the following figures, the air cleaner housing 201 is configured specifically to accept more than one size of primary filter cartridge, securely, as alternatives. That is, for example, the air cleaner housing 201 can be used with a first primary filter cartridge of a first axial length, or can alternatively be used with a second primary filter cartridge of a second, different, axial length. Examples of this are discussed below in connection with other figures. Configurations that allow for this, provide for a wide variety of options in the use of the air cleaner 200. In particular the same air cleaner 200 can be used with a variety of different specific vehicles, depending on the vehicle engine size and air cleaner demands, by modifying the installed filter cartridge without modifying the air cleaner housing itself. Also the same vehicle can be provided with different primary filter cartridge configurations, depending on the environment of use (for example: city; over-the-highway; and, off-road).

Herein the term “axial length” when used in connection with a primary filter cartridge, is meant to refer to a direction of extension generally between, or generally parallel with, a direction between inlet and outlet flow faces. A total overall axial filter cartridge, of course, would be measured including axial projection of any structures positioned on the media pack projecting axially outwardly therefrom. The total axial length of the media pack, would typically only refer to a maximum distance between the inlet flow face and the opposite outlet flow face.

Referring to FIG. 9, although alternatives are possible, the particular air cleaner 200 depicted, is configured for utilization with various alternative primary filter cartridges that each have a housing seal member that seals in place using an outwardly directed radial seal. This type of seal is discussed in greater detail below. Referring to FIG. 9, secure, sealing, engagement of a filter cartridge in the housing 201 is necessary to proper primary filter cartridge operation, to ensure that unfiltered air does not bypass the primary filter cartridge in moving from the inlet 210 to the outlet 211. The air cleaner housing 201 of FIG. 9, is provided with a housing seal surface for engagement by the filter cartridge at 230. That is, ring or track 230 comprises a continuous housing seal surface for a primary filter cartridge carrying a radial housing seal thereon, as described below.

In the previous paragraph reference was made to the housing seal member sealing in place using an “outwardly directed radial seal.” The term “radial” in this context, is generally meant to refer to a direction generally perpendicular to an axial direction of extension of a media pack or filter cartridge. The term “outwardly” in this context, is meant to refer to a direction radially outwardly from a center axis of the media pack. These terms are discussed further below, in connection with drawings that show the primary filter cartridges.

It is noted that interior 214 i of base 214 is configured with multiple (in this instance two) biasing tracks therein, to accommodate two different sized elements. A first biasing track is indicated generally at 236 and a second at 237. Operation and use of these biasing tracks will be understood from further discussion below. In general, however, it should be noted that the first biasing track 236 is positioned a different distance from inlet section 202 and outlet section 203, that is the second biasing track 237. That is, the two biasing tracks 236, 237 are spaced, axially, within the air cleaner housing 201, with biasing track 237 closer to the outlet section 203, and biasing track 236 positioned closer to the inlet section 202. Typically air cleaner housings according to the present disclosure will include at least two primary filter cartridge biasing tracks, although more than two are possible. Herein first and second biasing tracks will be discussed, and features thereof, without regard to whether they are the only two biasing tracks on only the first and second of more than two biasing tracks.

Still referring to FIG. 9, it is noted that the air cleaner housing 201 depicted, is generally configured for receipt of filter cartridges having exterior seal perimeter (peripheral) shapes that are generally oval (two narrowly curved ends with opposite sides) and media packs that have an exterior perimeter (peripheral) shape that is generally oval (again two narrowly curved ends with opposite sides). A typical oval arrangement would be a perimeter shape referred to herein as racetrack, in which the perimeter definition of both the seal and the media pack is to have opposite curved ends with opposite, generally parallel, sides extending therebetween. This is shown and discussed below, with example primary filter cartridges. Of course the principles described herein can be applied with alternate configurations of primary filter cartridges and/or seals, for example circular or alternate oval shapes in which not only are the two ends curved, but the opposite sides are also curved.

In FIG. 10 a side elevational view of the air cleaner 200, FIG. 9, is viewed. Again the air cleaner housing 201 is viewed with the access cover 206 removed. Referring to FIG. 10, one can see that the first biasing track 236 is generally u-shaped track having opposite sides 236 a, 236 b, (adjacent opposite housing sides 201 x and 201 y respectively) and a rounded center 236 c, positioned between the sides 236 a, 236 b. A similar track is discussed in PCT Publication WO 05/107924, published Nov. 17, 2005, incorporated herein by reference.

Biasing track 236 generally finds a unshaped slide surface 236 s which is oriented directed axially, generally toward outlet section 203 and away from outlet section 202. Surface 236 s, as discussed below, is generally in a plane not quite perpendicular to a direction of extension between sections 202, 203, but rather tilted slightly with respect to a plane perpendicular to a flow direction between inlet section 202 and outlet section 203 such that center 236 c is slightly closer to outlet section 203, than are side tips 236 t of each of the side sections 236 a, 236 b.

The second biasing track 237 is also viewable having generally u-shape with opposite sides 237 a, 237 b, and rounded center 237 c. Again, it is noted that biasing track 237 is positioned axially closer to outlet section 203 than is by track 236. Alternately stated, biasing track 236 is positioned closer to inlet section 202 than is biasing track 237.

The second biasing track 237 generally defines a track surface 237 s oriented directed axially toward outlet section 203 and away from outlet section 202. Surface 237 s typically is planar, and is typically oriented in a plane not quite perpendicular to a flow direction between sections 202 and 203, but rather slanted slightly therefrom, typically at a different declination angle than surface 236 s, as discussed below. For surface 237 s, tips 237 t, then, are generally oriented closer to section 202, than is the surface 237 s in center 237 c.

Typically, the biasing tracks 236, 237 are configured with selected, different, dimensions. For the example shown, one dimensional difference is the width between the opposite sides of the u-shape. In particular for first biasing track 236, sides 236 a and 236 b (and tips 236 t) are spaced closer together, than the sides 237 a, 237 b (and tips 237 t) for the second biasing track 237. Such a difference in dimension can be utilized to advantage, as discussed further below.

Herein, in some instances a comparison will be made between the direct distance between tips 236 t and the direct distance between tips 237 t, with a comparison being that the distance between tips 237 t is greater than the distance between 236 t. When the term “direct distance” is used in connection with this comparison, the intent is to refer to the shortest distance between the tips characterized, not the distance that follows the u-shape of the corresponding biasing track.

Referring to FIG. 10, for the example shown the larger dimension for biasing track 237, in width between sides 237 a, 237 b, is accommodated by providing an outwardly directed unshaped trough or projection segment 239, in which surface 237 s forms one of the axial sides, i.e., a side closest to inlet section 202 and facing outlet section 203.

As above noted, each of the unshaped biasing tracks 236, 237 generally extends inwardly of section 214 at an acute angle tapering toward outlet section 203 from inlet section 202. Somewhat different angles can be used, to advantage, for these two tracks. Typically each of the tracks will extend at a declination angle of at least 0.5°, usually not more than 15°, typically within the range of 2° to 10°. The term “declination angle” as used in this context, is meant to refer to an acute angle between a plane defining a respective one of the tracks 236, 237 and a plane perpendicular to the general direction of air flow through air cleaner 200 from inlet 202 to outlet 203. Typically when a difference in the declination angle is used for the two tracks 236, 237, it is at least 0.5°.

Dimensions provided in FIG. 10, for the example shown, are as follows: CA=744.3 mm; CB=336.8 mm; and, CC=330.1 mm.

As indicated previously, air cleaner housing 201 is configured to allow for alternate receipt for at least two different sizes (lengths) of primary filter cartridges therein. This is facilitated by the two biasing tracks 236, 237. As indicated, the air cleaner 200 could be provided with a biasing track arrangement that allows for more than two alternate possibilities for cartridge lengths using the same principles discussed.

Although alternatives are possible, typically the air cleaner housing 201 would be configured to alternately accept different cartridges which differ in overall axial length by at least 40 mm, typically at least 60 mm, often at least 80 mm, and usually 100-200 mm, although alternatives are possible. The distance between the locations of the biasing tracks 236, 237 is not necessarily the same as the difference of the lengths of the cartridges, since in one example shown the cartridge engages a biasing track at its end, whereas the second cartridge engages a biasing track at a location spaced from an end of the media pack. However, in general, a difference in axial spacing between the biasing tracks will be at least 40 mm, typically at least 60 mm, and usually at least 80 mm. Often the distance is also within the range of 100-200 mm.

B. An Example First Primary Filter Cartridge and Installation.

In FIGS. 11 and 12, a first primary filter cartridge 250 is depicted for installation in air cleaner 200. Specifically, primary filter cartridge 250 is configured to be installed in a position extending between a location contacting (or if not contacting adjacent) first biasing track 236 (FIGS. 9 and 10) with sealing at housing seal surface 230. Thus, for the example shown in FIGS. 9 and 10 the first filter cartridge 250 is sized as a maximum (axial) length (or nearby maximum length) cartridge that can be fit within interior 214 a of housing base 214.

In FIG. 11 a top plan view of the filter cartridge 250 is depicted. The cartridge 250 is oriented as it would be during installation in the housing 201, with the observer looking down the filter cartridge 250.

Referring to FIG. 11, the filter cartridge 200 includes the following general features: media pack 251; seal arrangement 252; guide arrangement 253; and, handle arrangement 254.

The media pack 251 generally comprises z-filter media in accord with the descriptions provided above. As explained above, z-filter media can be provided in any of two forms: as a coiled arrangement of a single facer comprising a fluted (corrugated) media sheet secured to a facing media sheet; or, as a stack of strips of single facer each comprising a fluted (corrugated) media sheet secured to a facing media sheet. Either type of arrangement can be provided with the general techniques described herein. However, the assemblies depicted are specifically configured for use with coiled arrangements, and variations in shape and other detail would typically be used when a stacked media pack arrangement is to be used. Thus, the example media pack 251 depicted comprises a coiled z-filter media arrangement 251 z, comprising a fluted (corrugated) media sheet secured to a facing media sheet, coiled with the facing sheet directed outwardly.

The media pack 251 generally includes (defines) an inlet face 255 and an outlet face 256. The outlet face 256 is generally located at an opposite (axial) end of the media pack 250 from the inlet face 255.

The media pack 251 is generally closed to flow of air therethrough, between inlet face 255 and outlet face 256, unless the air passes through a media sheet (fluted or facing) with filtering.

The particular media pack 251 depicted has a generally obround perimeter (peripheral) shape, particularly an oval perimeter shape comprising two opposite curved ends 251 a, 251 b with sides 251 c and 251 d extending therebetween. The particular shape is racetrack, with sides 251 c and 251 d being approximately straight and parallel to one another.

The seal arrangement 252 is depicted mounted at an end of the media pack 251 defining outlet face 256. However in some embodiments, alternate arrangements are possible. The seal arrangement 252 comprises housing seal member 265 oriented, positioned and sized to form a housing seal with housing seal surface 230, FIG. 9, when cartridge 250 is operably installed within an interior 201 a of housing 201. The particular housing seal arrangement 252 depicted is positioned and configured for housing seal member 265 to form an outwardly directed radial seal, compressed upon engagement with region 230. A variety of types of housing seal arrangements 262 are possible, selected ones of which are described in U.S. Pat. Nos. 6,783,565, 6,190,432, 6,350,291, 6,610,117, U.S. Publication US 2005/0166561, published Aug. 4, 2005, PCT Publication WO 05/63361 and U.S. Provisional Application 60/735,650, filed Nov. 9, 2005, incorporated herein by reference. Some examples of such seal arrangements are discussed briefly below. Typically, the housing seal region 265 comprises a compressible polymeric material, for example foamed polyurethane positioned around rigid structural member, against which the polymeric material in region 265 can compress, when inserted into region 230, FIG. 9.

Typically, the seal region 265 is positioned at a location axially beyond end face 256 of the media pack 251, in a direction opposite face 255. That is, the seal region 265, which sealingly engages housing section 230, does not extend around the media pack 251, but rather is mounted on a frame structure or extension projecting axially outwardly from the media pack 251, away from the media pack 251 in a direction opposite surface 255. For the example shown, the seal region 265 is part of an overmold 266 which has a second, but integral, portion 267 that does engage and surround the media pack 251.

The principles described herein can be utilized with alternate seal arrangements, including ones that extend around a media pack. However for the particular housing 201 depicted, and primary filter cartridges 250 described herein, a seal arrangement 252 described, in which the housing seal member 265 includes a radially outwardly directed seal region positioned at a location axially outwardly from the media pack 251, is typical.

Still referring to FIG. 11, for the example shown, filter cartridge 250 includes, mounted on (and in the example shown surrounding) the media pack 251 at a region adjacent end face 255, a preform support 270. The term “preform” as used herein in this and related contexts, refers to a structural member formed and then later attached to the media pack 251, during assembly of the cartridge 250. The preform support 270 includes, among other things, guide arrangement 253 and handle arrangement 254. In addition, the particular preform support 270 depicted, includes an inlet end grid 271 which extends across face 255.

Typically, the preform support 270 would be molded from an appropriately robust plastic material with the features of the inlet grid 271, guide arrangement 253 and handle arrangement 254, molded integrally as part thereof.

For the example shown, the guide arrangement 253 comprises an edge 253 a of the preform support 270 adjacent (typically slightly axially outwardly from) end face 255. Some or all of the edge 253 (guide arrangement 253) engages some or all of surface 236 s of the first biasing track 236, slidably, during installation of the cartridge 250 into housing interior 201 a. More specifically, during installation of cartridge 251, edge 253 a of the guide arrangement 253 is positioned in axial overlap in contact with surface 236 s, to slide therealong during installation.

Referring now to FIG. 12, preform support 270 includes handle member 254 thereon, positioned on a platform region 275 of support 270. The example handle member 254 depicted, is positioned in overlap with one of the curved ends 251 b of the media pack 251.

Handle member 254 is sized and shaped to be easily grasped by an installer and service provider. It is also sized with a perimeter (in this instance generally rectangular with finger scallops) to engage a feature in the access cover 206, FIG. 6, discussed below. The particular perimeter definition of handle member 254 for the example shown, FIG. 12, includes finger scallops or depressions 254 a on opposite sides of handle member 254, directed toward faces 255, 256 respectively. For the example shown, a service provider's fingers can be positioned under surface regions 254 b under each of the opposite sides 254 c, facing surface 256, and 254 d, facing surface 255. Alternate arrangements are possible.

During installation, the handle member 254 is typically grasped, and the cartridge 250 is inserted into base interior 214 i with: end 277, FIG. 11, of the seal region 265, and end 251 a of the media pack 251 first inserted; and, with the guide arrangement 253 slidably positioned against (and in engagement with) surface 236 s of the first biasing track 236, FIG. 10. With continued insertion, the cartridge 250 will slide along surface 236 s of the biasing track 236, pushing the seal region 265 further into engagement with housing seal surface 230. Initial engagement will involve end 277 overlapping housing seal surface 230. Final securement of the housing seal occurs by the service provider tipping the cartridge 250 in the direction of arrow 280, FIGS. 13 and 14, to position the cartridge 230 in sealing orientation. This will ensure that the housing seal region 265 is fully engaged with the housing seal surface 230, in a radial sealing manner. In FIG. 14, a view analogous to FIG. 13 is shown, from a top view, and with the inlet section 202 of the housing modified from the inlet section 202 of FIG. 13.

It is noted that in FIGS. 13 and 14, the cartridge 250 is already maximally tipped in the direction of arrows 280, into full sealing.

Referring to FIGS. 9-14, it will be understood that engagement between the preform support 270 (in particular edge 253 a of guide arrangement 253) and the biasing track 236 occurs as a sliding engagement with guide arrangement 253 contacting axial slide surface 236 s of track 236. The term “axial” in this context, is meant to refer to the fact that surface 236 s which faces axially toward outlet section 203 from inlet section 202. Once the final seal engagement occurs, FIG. 13, guide arrangement 253 will be tipped out of axial or sliding contact with all or a portion of surface 236 s. Whether or not contact is retained (after tipping into sealing engagement) between guide arrangement 253 and a portion of center 236 c, FIG. 9, is dictated by the various dimensions of the components involved. However, the tipping described, will typically move the guide arrangement 253 out of direct contact with sides 237 a, 237 b.

In FIG. 15, a side elevational view showing primary filter cartridge 250 installed in housing 201 is also shown. It can be seen that the cartridge 250 substantially fills the space between the first biasing track 236 and the housing seal surface 230. However, it is noted, again, that the cartridge 250 is tipped slightly away from complete (and in some possible instances all) contact with the first biasing track 236.

Still referring to FIG. 15, it is noted that the second biasing track 237 is not engaged by the cartridge 250. Rather the biasing track 237 is depicted unused, within projection 239, surrounding cartridge 250. As a result, it is observed that media pack 251 extends across biasing track 237, without engaging the biasing track 237; and the filter cartridge 250 does not engage slide surface 237 s of biasing track 237.

When the access cover, discussed below in connection with FIG. 16, is installed, provision is made to prevent the cartridge 250 from tipping in the direction of arrow 281, FIG. 15, out of the sealed arrangement shown in FIGS. 13-15.

Example dimensions provided in FIGS. 11-15 are as follows: DA=286.6 mm; DB=9.4 mm; DC=447.7 mm; EA=256.7 mm; EB=271.2 mm; FA=744.9 mm; FB=304.6 mm; FC=491.4 mm; GA=744.3 mm; GB=336.8 mm; and, GC=330.1 mm.

FIG. 15A is an enlarged fragmentary view of a portion of FIG. 15, showing a portion of the cartridge 250 positioned relative to the first biasing track 236, after installation. In FIG. 15A, example dimensions provided are as follows: HA=5.5 mm; HB=12.0 mm.

Referring to FIG. 12, the preform 270 includes opposite spacers or spacer projections 283, 284 centrally positioned along opposite sides 251 d, 251 c, respectively of the primary filter cartridge 250. Referring to FIG. 11, in which spacer projection 283 is depicted, each spacer projection 283, 284 typically extends generally parallel to inlet face 255 and projects radially outwardly from an adjacent portion of preform 270. The term “projects radially outwardly” in this context, refers to a projection away from the media pack 251 and preform 270, in a direction radially outwardly from a center of the media pack 250, as opposed to directed axially as discussed above. A typical amount of radial outward projection is at least 2 mm, typically 3 to 15 mm, inclusive, usually 4-12 mm inclusive, relative to adjacent portions of preform support 270 although alternatives are possible. Referring to FIGS. 15 and 15 a, the spacers 283, 284 facilitate stable positioning of the cartridge 250 within the housing interior 201 a by filling space between preform 270 and an interior wall region 285, of housing interior 201 i. This will facilitate installation and stable positioning of the cartridge 250 once installed.

Referring to FIG. 11, each spacer 283, 284 typically extends along a respective side (251 c, 251 d) of side 251, a distance of at least 40 mm, usually at least 60 mm, typically not more than 150 mm and often within the range of 60 mm to 100 mm. In more general terms, for an oval media pack 251 as depicted, the spacer projections 283, 284 typically extend a distance corresponding to at least 5%, and typically within the range of 5% to 40% of the maximum width of the media pack 251 between outer surfaces curved ends 251 a, 251 b. Herein, a distance of extension of the side spacer projections 283, 284 between opposite ends, will sometimes be referred to as the “length of extension.” Typically, each one of the spacer projections 283, 284 is continuous along its length of extension. However, in some instances gaps can be provided.

In FIG. 15A, dimension between opposite axial sides 284 a, 284 b of the projection 284, will be referred to as the axial thickness of the projection 284. Typically each of the spacer projections 283, 284 has an axial thickness of at least 6 mm, and usually within the range of 6 mm-15 mm, inclusive, although alternatives are possible.

It is noted that the spacers 284, 285 are spaced from end face 255 of the media pack. This will be typical for arrangements as described herein. The amount of this spacing can be varied, depending on the particular housing arrangement, but typically will be at least 10 mm, usually at least 15 mm. For the particular example shown in FIGS. 15 and 15A, projections 283, 284 are spaced from end face 255 by a distance of at least 18 mm (typically 15-25 mm), although alternatives are possible.

Attention is now directed to FIG. 16 in which a cross-sectional view is taken of the assembly 200, generally along line 16-16, FIG. 15. It is noted that for the orientation of FIG. 16, the view is looking up into the upper half of the assembly 200 of FIG. 15, but the assembly has been inverted for the typical viewer to be looking down onto the picture.

In FIG. 16 the housing 201 is shown with an inlet section 202 corresponding generally to that shown in FIG. 14, but it could be modified in accord with the discussions herein. Further in FIG. 16 the housing 200 is depicted with an outlet section 203 generally in accord with FIG. 14, but it could be modified in accord with the descriptions herein.

Cartridge 250 is shown positioned within housing interior 201 a, in particular in section 205. Access cover 206 is depicted positioned in place as part of housing section 205.

Selected features of the access cover 206 relating to the installation of cartridge 250 are as follows: (a) the access cover 206 includes interiorly directed projection 290 thereon positioned to extend axially behind a portion of end 255 of the media pack 251, and also behind an axial end of preform 270. The term “behind” in this context, is meant to refer to a projection or extension to a location between the cartridge features indicated (end 255 and preform support 270) and outlet section 202. Projection 290 will prevent the cartridge 250 from tipping or backing out of sealing contact with housing seal surface 230, in the direction of arrow 281, until access cover 206 is removed. Referring to FIG. 16, end face 256, in this instance an outlet face of media pack 250 is viewable, as well as outlet end preform 295 including rigid seal support 296 positioned radially supporting housing seal arrangement 265. In addition outlet end preform 295 is shown with a grid 297 extending across face 256.

Another feature in access cover 206 is receiver 300 sized and positioned to receive therein handle arrangement 254, as a projection, in a mating manner, when service cover 206 is installed. The receiver 300 will help stabilize the cartridge 250 is proper position, and will help ensure that a proper cartridge 250 has been installed, for the air cleaner configuration desired.

Many of the housing of the filter cartridge features just described, are also characterized in PCT Publication WO 05/107924, published Nov. 17, 2005, incorporated herein by reference.

Still referring to FIG. 16, it is noted that opposite access cover 206, housing base 214 includes a receiver section 305, with a greatest depth, relative to the cartridge 250, provided adjacent face 255 as shown at 305 a. The receiver section 305 facilitates dismounting the cartridge 200 as follows. The access cover 206 is removed, after disengaging the latches 216, FIG. 6. Then, by manipulating the cartridge 250, for example by pressing on handle arrangement 254, the handle 254 will tip in the direction of arrow 281 and a portion 306 of the cartridge 250 will push into receiver 305. This movement pulls edge (region) 278 of the seal arrangement 265 out of sealing contact with region 230. The cartridge 250 is now loosened, and it can be removed for example by grasping and pulling the handle 254. This type of arrangement for mounting and dismounting a filter cartridge is generally described in PCT Publication WO 05/46841, published May 26, 2005, incorporated herein by reference.

Still referring to FIG. 16, it is noted that for the air cleaner assembly 201 depicted, the housing seal surface 230 is positioned within the same modular component that forms outlet section 203. Variations from this are possible, however.

It is noted that the air cleaner 200 can be configured (typically by modification of outlet section 203), for receipt therein, and mounting therein, of a secondary or safety filter if desired. Such arrangements as those described in PCT Publication WO 05/107924, published Nov. 17, 2005, incorporated herein by reference, could be adapted for systems in accord with the principles described herein.

In FIG. 17, a cross-sectional view analogous to FIG. 16 is depicted except showing the air cleaner housing 201 without cartridge 250 installed, but with access cover 206 in place.

C. Installation of a Second, Shorter, Filter Cartridge within the Air Cleaner Housing 201 as an Alternative, FIGS. 18-24.

As discussed previously, the air cleaner assembly 200 is specifically configured as to be capable of alternately receiving, securely, as least two different sized filter cartridges therein, depending on the needs of the vehicle or vehicle operator. By “alternately receiving” in this and related context, it is meant that the air cleaner housing 201 can be configured to receive a first sized primary filter cartridge or second sized primary filter cartridge, but not the two at the same time. Description of features and installation of a second, shorter, filter cartridge is described in connection with FIGS. 18-24.

Turning first to FIGS. 18 and 19, a second filter cartridge 350 is depicted also sized and configured to be mounted with an air cleaner 200, analogously to cartridge 250, but having a smaller length dimension between flow faces and thus occupying less space of interior 201 a. Referring to FIG. 18, the second filter cartridge 350 comprises a media pack 351 seal arrangement 352, guide arrangement 353 and handle arrangement 354. The media pack 351 includes an inlet face 355 and an opposite outlet face 356. The media pack 351 may be generally as previously described for media pack 251, except configured and sized for the particular example shown. The particular media pack 351 shown, comprises a coiled media pack fluted (corrugated) media sheet secured to a facing media sheet with the facing media sheet directed to the outside. The coiling is in an oval shape, having opposite curved ends 351 a, 351 b with opposite sides 351 c and 351 d extending therebetween. The particular example shown is racetrack, with opposite sides 351 c and 351 being generally straight, in extension between the curved ends 351 a, 351 b. In FIGS. 18-19, the dimensions indicated, as an example, are as follows: IA 473.0 mm; IB=163.6 mm; JA=23.1 mm; JB=257.0 mm; JC=23.1 mm.

Although alternatives are possible, typically a length between opposite flow faces for a smaller cartridge, installed within arrangements according to the present invention, by comparison to the larger cartridge, will be such the smaller cartridge is at least 40 mm shorter in length, typically at least 60 mm shorter, often at least 80 mm shorter in length, and in many instances at least 100 mm shorter in length, for example 100 mm-200 mm shorter, inclusive. Alternatives from this, of course, are possible.

The seal arrangement 352 may be generally as described previously for seal arrangement 252, in some instances can be identical. Thus, the depicted housing seal arrangement 252 comprises housing seal member 365 and an integral portion 366; the integral portion 366 surrounding media pack 351 and the seal member 365 being positioned on a support projecting axially outwardly away from the media pack face 356, in a direction opposite face 355. The housing seal member 365 defines an outer periphery for the example shown that is of a same general shape as the outer periphery of the media pack 351, in this instance oval with two opposite curved ends and two opposite sides, the example shown being racetrack with the opposite sides being straight and parallel to one another. Further, media pack 350 comprises a preform support 370 positioned thereon including an end grid 371 extending across face 355. The preform support 370 includes many features analogous to preform support 270, but is sized and shaped differently for convenience. In particular handle arrangement 354, positioned on preform support 370, is of a smaller size (and different shape) than handle arrangement 254, for convenience.

In FIG. 19, a plan view of the filter cartridge 350 is depicted; the view point is looking toward the handle arrangement 354 as it would be oriented for installation in the housing 201, when the housing 201 is positioned generally as shown in FIG. 6. The preform support 370 includes opposite sides 374, 373, with spacers 383, 384 respectively projecting radially outwardly therefrom. The distance between sides 373, 374, is preferably greater than interior dimension of the housing 201 between regions 201 x, 201 y, FIG. 10, inhibiting the cartridge 350 from being installed using first biasing track 236. Typically and preferably the distance between the sides 373, 374 is sufficiently large that the cartridge 350 can only be installed if the sides 373, 374 are positioned in the trough shaped projection 239, FIG. 10. The sides 373, 374 depicted generally comprises opposite, radially outwardly directed, slide projections each of which has an axial face 374 a, 373 a facing generally in the direction of the inlet face 355. These are positioned to engage the slide surface 237 s of biasing track 237, during installation. The slide surfaces 373 a, 374 a, which are positioned to engage slide surface 273 s of the biasing track, are typically at least 5 mm, and usually at least 10 mm wide, in projection outwardly from an adjacent portion of preform support 370, not including the amount of projection of the side projections 383, 384. The radial slide projection comprising projections 373, 374 is typically positioned spaced from inlet face 355 toward outlet face 356 by a distance of at least 10 mm, typically 10-40 mm, often at least 15 mm, for example 15-30 mm, inclusive, although alternatives are possible.

Proper installation of the filter cartridge 350 will be understood by reference to FIGS. 20-24.

Referring first to FIG. 20, the cartridge 350 is shown installed within housing 201, without access cover 206 in place. That is, the cartridge 350 is positioned with seal member 352 in sealing engagement with housing seal track 230. The cartridge 350 is installed by first engaging some or all of guide arrangement 353 with some or all of biasing track 237, and sliding the cartridge 350 against the track surface 237 during installation. Once sliding is completed, the cartridge 350 would then be rocked or tipped in the direction of arrow 390, to complete the sealing. (In FIG. 20, the cartridge 350 shown tipped as far in the direction of arrow 390 as it will go, during installation.) Thus, installation is analogous to cartridge 250, but using a biasing track 237. In FIG. 20, the cartridge 350 is shown installed after the tipping in the direction of arrow 390 has occurred.

Referring still to FIG. 20, it is noted that housing 201 includes a unshaped trough 392 (in both cover 206 and base 214) positioned as an inside of projection 239 and positioned to receive edge 370 e of preform 370 therein, during installation. One axial inside surface (the side 237 closest to inlet section 202 and facing outlet section 203) of the receiver 392 comprises biasing surface 237. The groove or trough 392 preferably has a greater direct dimension in width between tips 237 t than the dimension directly between tips 236 t of track 236. The cartridge 350 cannot be inadvertently installed utilizing track 236, since the distance between side projections 373, 374 is too great.

It is noted that groove or trough 392 is sized, to accommodate the tipping motion of the cartridge 350. That is, the groove or trough 392 has a general v-shape, so that side-projection 373, 374 with projections 384, 383, respectively thereon, can tip forwardly than the groove 392.

Of course dismounting of cartridge 350 would generally involve a reverse process, with an overall operation analogous to that described for cartridge 250 above.

In FIG. 21 a top plan view of air cleaner 200 with cartridge 350 sealingly installed therein is shown, without access cover 206 in place. It is noted that inlet section 202 for the arrangement of FIG. 21 is depicted modified from inlet section 202, FIG. 20, but analogous principles are involved. In FIG. 21, the indicated dimensions are as follows: KA=744.9 mm; KB=304.6 mm; KC=491.4 mm.

In FIG. 22, air cleaner 200 is depicted following positioning cartridge 350 (FIG. 21) with access cover 206 in place. The access cover 206 is secured in place by latches 216. The access cover 206 includes a receiver 398 positioned to receive handle member 354, FIG. 21, therein. The receiver 398 will be configured to prevent handle 354 for moving rearward, in the general direction of arrow 399, FIG. 21, which movement would dislodge the cartridge 350 from a proper sealing orientation. Thus, with an arrangement as depicted, the access cover 216 is configured to prevent the shorter cartridge 350 from backing out of secure engagement once installed. The access cover 206 further includes a groove shaped receiver 398 a, as part of groove 392, to receive a portion of projections 374, 373 therein, when cover 206 is in place, again stabilizing the position of the cartridge 350.

In FIG. 22, the indicated, example, dimensions are as follows: LA=744.3 mm; LB=336.8 mm; and, LC=330.1 mm.

In FIG. 23, an enlarged fragmentary view of a portion of the assembly as depicted in FIG. 20 is shown. In FIG. 23, spacer 384 can be viewed helping to center and support the cartridge 350 in position, within receiver 392. Spacers 384, 383 can be shaped and be dimensionally analogous, to spacers 280, 281 discussed above, except modified to accommodate groove projection 392.

In FIG. 23 the indicated dimensions are as follows: MA=7.8 mm; MB=10.5 mm.

FIG. 24, a cross-sectional view analogous to FIG. 16 is shown of the air cleaner 200, but depicting the smaller or shorter cartridge 350 in place. Housing seal arrangement 352 can be viewed as secured against housing seal track 230 by compressing the seal member 365 against support 400, support 400 projecting axially outwardly from face 356 in a direction opposite face 355. Grid work 401 extending across face 356 can be used to stabilize the media pack 351.

Referring again to FIG. 20, it is noted that the example handle arrangement 354 shown has designation different from handle arrangement 254, FIG. 12. Although alternatives are possible, the particular handle arrangement 354 depicted is configured to have one edge 354 a, which faces toward outlet section 203, that is scallop-shaped for receiving fingertips. Further the edge 354 a is positioned so that fingers can be pushed underneath it, to facilitate manipulation of cartridge 350. An edge 354 b, opposite edge 354 a, for the example shown, is closed, meaning it has no undercuts or similar structure, in a typical preferred arrangement. Alternatives are possible.

It is noted that the size of top 354 c of handle arrangement 354 is generally smaller than a perimeter size of top 254 c, of handle arrangement 254, FIG. 12. Variations from these definitions are possible, but the examples shown are typical.

D. Selected Structural Variations, System of Use and Example Seal Variations, FIGS. 25-32.

(a) Seal Variations, FIGS. 28-31.

In FIGS. 28-31, some structure variations for the seal arrangements are discussed and shown. In FIG. 28 an example media pack 451 is depicted, which can correspond to either media pack 251 or media pack 351. A housing seal arrangement 452 is depicted comprising a seal member 453 with an integral portion 454. Support 455 for backing up the seal during compression is shown. The support 455 is secured to the media pack 451 by the overmold 454. Grid 457 is shown extending across media pack (downstream) flow face 458. The type of seal arrangement depicted in FIG. 28 is generally analogous to the ones depicted in previously discussed figures, and is discussed in detail in U.S. patent application Ser. No. 11/019,883 filed Dec. 21, 2004; and PCT Publication WO 05/63361, published Jul. 14, 2005, incorporated herein by reference.

In FIG. 29, an alternate arrangement is shown. Here seal member 480 is molded onto a support 481. The support 481 would be secured to the media-pack by an adhesive or other material, but not by a structure integral with the seal arrangement 480. Thus for typical operation, the seal member 480 would be premolded onto the support 481, and then the combination would be secured to the media pack. Such seal arrangements are described for example in U.S. Pat. Nos. 6,783,565, 6,190,432, 6,350,291, 6,610,117, incorporated herein by reference. These principles can be applied with media packs installed in air cleaners according to the present disclosure.

In FIG. 30, a fragmentary view of a seal arrangement 490 including a single step or champfer section 491 is depicted. This configuration can be used as an alternate shape for the seal region for either the arrangements of FIG. 28 or FIG. 29. Such arrangements are described for example in U.S. Provisional Application 60/735,650, filed Nov. 9, 2005, incorporated herein by reference.

Finally in FIG. 31, a housing seal arrangement 500 is depicted which utilizes a support 501 having a projecting lip 502 to manage sealing rise, during a molding operation. In FIG. 31, the media pack is shown at 504. Such an approach, which is a modification of the approach described in FIG. 28, is discussed in detail in U.S. Provisional Application 60/735,650, filed Nov. 9, 2005, incorporated herein by reference.

An example polymeric material useable for housing the seal regions (and overmold is present) as described herein is polyurethane. An example useable polyurethane is a foamed polyurethane which will increase in volume during use. Preferred ones increase by at least 40% in volume, to fill the mold cavities (typically at least 80% in volume) and having an as-molded density of no greater than 30 lbs/cu.ft (0.48 g/cc), typically no greater than 22 lbs/cu.ft. (0.35 g/cc) and usually with in the range of 10 lbs/cu.ft (0.16 g/cc) to 22 lbs/cu.ft (0.35 g/cc); and, a hardness (Shore A) typically of not greater than 30, preferably not greater than 25 and typically within the range of 10 to 22. Of course polyurethanes outside of this range can be used, but the characterized ones are advantageous for manufacturing and handling.

(b) Housing Variations and Use, FIGS. 25-27 and 32.

In FIGS. 25 and 26, variations in air cleaners are possible by the modular constructions are depicted. Referring first to FIG. 25, air cleaner 200 is depicted with inlet section 202, outlet section 203, center section 205 with base 214 and access cover 206. The inlet section 202 is provided with an inlet arrangement 210 which in this instance is a side inlet 210. In FIG. 26, an analogous structure is shown, with the side inlet 210 of inlet section 202) directed in an opposite direction. Modular construction allows for fitting the parts together in these alternate constructions.

In FIG. 27, a fragmentary, schematic depiction of an air cleaner 200 positioned under the hood 600 of a vehicle 601 is provided. The air cleaner 200 is positioned above the engine block 605. The particular air cleaner 200 depicted, includes bellows member 610 around inlet 611, positioned to engage structure 620 on the hood 600, during operation, when hood 600 is lowered. Of course as discussed above, alternatives are possible. From a review of FIG. 27, it will be apparent that the profile for the air cleaner 200 depicted in the various figures, is convenient for positioning above an engine block 605 and below a hood 600 of a vehicle such as a truck.

Referring to FIG. 32, air cleaner 200 is shown with housing 201 having cartridge 250 positioned therein, and an access cover removed. The air cleaner includes inlet section 202 and outlet section 203. The inlet section 202 is defined with dual inlet tubes in inlet arrangement 210, at 210 a, 210 b. The tubes 210 a, 210 b can be configured to receive inlet air from two different locations, for example from separate air intake vents on opposite sides of a vehicle.

E. Summary of Selected Features and Feature Combinations.

In general terms, herein above an air cleaner assembly is disclosed including a housing defining an interior and having: an air flow inlet section; air flow outlet section; primary filter cartridge receiving section between the air flow outlet section and the air flow inlet section; and, an access cover removably positioned on the primary filter cartridge receiving section. In an example shown, the housing also includes a primary filter cartridge housing radial seal surface, for sealing an installed filter cartridge in use.

The primary filter cartridge receiving section of the housing includes at least first and second primary filter cartridge biasing tracks. In the example shown, two biasing tracks are depicted, but it is described that more biasing tracks can be used.

A first one of the at least two primary filter cartridge biasing tracks is spaced, axially, first distance (D10) from the housing seal surface. A second one of the at least two primary filter cartridge biasing tracks is spaced axially a second distance (D20) from the housing radial seal surface. The first distance (D10) is greater than the second distance (D20). More generally phrased, the first primary filter cartridge biasing track is spaced from a region in which a cartridge arrangement seals to the housing (radially or otherwise) a first distance (D10) and the second primary filter cartridge biasing track is spaced from the same region a second distance (D20), with the distance (D10) being greater than the distance (D20). Thus the arrangement is configured to bias at least two different size cartridges into position with the same seal arrangement.

In general, the assembly includes a first removable and replaceable filter cartridge positioned within the housing. The filter cartridge comprises a media pack having opposite inlet flow and outlet flow faces. The media pack is typically a z-filter media pack comprising a plurality of inlet flutes and outlet flutes extending between the inlet flow face and the outlet flow face. The inlet flutes are open adjacent the inlet flow face and closed adjacent the outlet flow face; and, the outlet flutes are closed adjacent the inlet flow face and open adjacent the outlet flow face, in a typical z-pack arrangement. The media pack is closed to passage of unfiltered air therethrough, between the inlet and outlet flow faces, so that air entering the inlet flow face must pass through the media in order to exit adjacent the outlet flow face. The primary filter cartridge includes a housing seal member thereon. For a typical arrangement described herein, the housing seal member is positioned in radial seal engagement with the primary filter cartridge housing radial seal surface.

In at least one assembly, with a larger or longer filter cartridge, the filter pack would have an axial length extending from a location adjacent the housing radial seal surface to allocation adjacent the first primary cartridge biasing track. By “adjacent” in this context, it is not meant that there is necessarily contact between the two described features.

In a second arrangement, the media pack would have an axial length extending from a location adjacent the first housing radial seal surface to a location substantially shorter than the first primary filter cartridge biasing track. In this instance, the cartridge would typically be installed using the second primary filter cartridge biasing track. Typically when installed with the second primary filter cartridge biasing track, the cartridge has an axial length of at least 40 mm, typically at least 60 mm, and usually at least 80 mm, and often 100-200 mm shorter than a distance between the housing radial seal surface and the first primary filter cartridge biasing track.

In general terms, an air cleaner assembly as disclosed, include primary filter cartridges (whether configured to use the first biasing track or the second biasing track) which include a preform support mounted on an end of the media pack opposite the housing seal member. The preform support includes a guide arrangement positioned to slidably engage a selected one of the at least two biasing track, during installation. In one example shown, the guide arrangement comprises an end edge of the preform support adjacent the inlet face. This type of arrangement, for the example shown, is used to engage the first primary filter cartridge biasing track, when that biasing track is positioned the furthest from the housing radial seal surface, of any of the biasing tracks.

In selected examples shown herein, the guide arrangement comprises a side projection or flange arrangement projecting radially outwardly from sides of the preform support location spaced at least 5 mm, typically at least 10 mm, usually at least 15 mm, for example 15-30 mm, from the inlet face toward the outlet face. Such a guide arrangement is not configured for engagement with a typical first biasing track as described herein, but rather is positioned for engagement with a second biasing track that accommodates a shorter filter cartridge than the first biasing track.

In typical arrangements, the air cleaner assembly is configured such that the access cover includes a primary filter cartridge engagement and retainment arrangement thereon. An example features of a primary filter cartridge engagement and retainment arrangement, is a projection on the cover which extends interiorly of the air cleaner, to a location behind a primary filter cartridge. Such an arrangement is shown and described in which the projection on the access cover is positioned to project to a location behind a primary filter cartridge that is installed utilizing the first biasing track, i.e., the longer possibility for a primary filter cartridge.

Other features of a primary filter cartridge engagement and retainment arrangement in the access cover, include spaced handle arrangement receivers in the access cover, each of which is sized and located to engage handle member on one of the possible primary filter cartridges for installation.

Another example feature of a primary filter cartridge engagement and retainment arrangement on the access cover, is a groove or trough, for engagement with a projection on one of the possible filter cartridges.

In an example shown, the first biasing track within the primary filter cartridge receiving section has a unshaped slide surface facing generally toward the air flow outlet and facing generally away from the air flow inlet section. This first unshaped slide surface includes side tips projecting toward the access cover and a center projecting away from the access cover. This first unshaped slide surface is typically planar and is positioned at plane, at an acute angle X, from a plane perpendicular to flow direction between the inlet section and the outlet section by at least 0.5°, typically 2°-10°. A typical arrangement is with the tipping such that the side tips of the first unshaped slide surface is spaced further from the outlet section than the center of the unshaped slide surface.

In example arrangements described herein, the biasing track also has a u-shaped slide surface with side tips projecting toward the access cover and a center projecting away from the access cover. The second unshaped slide surface in an example shown is planar is angled in an angle Y from a plane perpendicular to flow direction between the inlet section and the outlet section, by at least 0.5°, with the side tips further from the outlet section than a center of the unshaped slide surface.

Typically the angle X is different from the angle Y, usually the angle X is at least 0.5° larger than angle Y. The angle Y is typically within the range of 2° to 10°, inclusive.

Typically a direct distance between side tips of the first unshaped slide surface is smaller than a direct distance between side tips of the second unshaped slide surface. In this context the term “direct” is meant to refer to a shortest distance between the tips, as opposed to a distance that extends along the curve of the u-shape.

Typically a second biasing track is an interior slide surface of the unshaped outward projection or trough, in the primary cartridge receiving section of the housing.

Herein, various air filter cartridges are described for use in the air cleaner assembly. A typical air filter cartridge comprises a z-filter media pack as previously characterized. Typically that media pack has a perimeter shape with two opposite curved ends and two opposite sides extending therebetween, an example being oval and a specific example being racetrack as characterized herein. The principles can be utilized with other types of perimeter shapes, but the example shown utilize a shape as characterized.

A preform support is positioned on the media pack adjacent the inlet flow face. The preform support includes a handle arrangement thereon positioned overlapping one of the curved ends of the media pack. The preform support includes first and second opposite side spacer projections overlapping opposite sides of the media pack. Each one of the first and second side spacer projections typically has a length of extension corresponding to 5% to 40% of the maximum width of the media pack between the first and second curved ends, although alternatives are possible. By the term “maximum width” herein, it is meant to the largest distance across the media pack outside surfaces of the curved ends.

In typical filter cartridge of the type characterized, each one of the first and second side spacer projections has a radial outward projection of at least 2 mm, typically 3-15 mm, inclusive, relative to adjacent portions of the preform support. Also each one of the first and second side spacer projections typically has an axial thickness of at least 6 mm, and each one of the first and second side spacer projection is spaced at least 10 mm from an inlet end face of the media pack.

It is noted that the side spacer projections can be positioned on projections that include an axial surface for engagement with a slide track, although alternatives are possible. It is also noted that spacer projections can be continuous, however alternatives are possible.

In one example, the handle arrangement includes a lip projection directed axially toward the outlet face under which fingers can be placed, in a closed end (preventing fingers being placed thereunder) directed axially toward the inlet face.

IV. FIGS. 33-41; Additional Improvements

In FIGS. 33-41, additional improvements applicable, for example, to arrangements otherwise according to FIGS. 6-32 are described and shown. In FIGS. 33-36 an alternate cartridge is depicted, and in FIGS. 37-38 alternate air cleaner housing and air cleaner housing/cartridge interaction features are shown.

Referring first to FIG. 33, reference numeral 700 generally comprises an air filter cartridge including improved features as characterized. The cartridge 700 comprises a media pack 701 having an air flow inlet face 702 and an opposite air flow outlet face 703. The cartridge 701 may comprise a z-filter pack analogous to those described previously, for example corresponding to a fluted (typically corrugated) sheet secured to a facing sheet and coiled or otherwise formed into a media pack configuration as depicted. Media pack 701 may for example be identical to media pack 251, FIG. 11

Adjacent outlet end 703 is mounted housing seal arrangement 707. The housing seal arrangement 707 includes a housing sealing portion 708 and an over mold portion 709. The housing seal arrangement 707 may be analogous to similar features on cartridge 250, FIG. 11. In general terms, the housing seal portion 708 is configured to form an outwardly directed radial seal with an annular housing seal surface of a housing, into which cartridge 700 is positioned for use. Overmold portion 709 provides structure that secures the housing seal arrangement 707 to the media pack 701; although alternate methods of securement are possible. In a typical arrangement, housing sealing portion 708 is provided with a rigid backup member, to facilitate sealing.

Mounted at inlet end 702 is frame member 710 comprising a band 711 circumscribing media pack 701 and secured thereto, for example with an adhesive. Band 701 includes end section 713 with handle member 714 mounted thereon. In this manner, frame piece 710 can be analogous to member 270, FIG. 11.

Frame piece 710 further includes an end portion 720 which projects axially outwardly from the media pack 701 in a direction away from end 703, and provides an engagement member or arrangement for sliding engagement with a portion of a housing, during installation. This would be generally analogous to description for feature 253, FIG. 11.

Frame piece 710 further includes cross extension arrangement 725 extending there across, for structural stability. Features with analogous operation were described previously in connection with features 271, FIG. 11. A portion of arrangement 725 may also engage the housing in a slidable manner, for example, during installation.

In FIG. 33, a top plan view of 700 is provided, showing features viewable when looking down upon the cartridge or when oriented for installation when the housing is oriented analogous to FIG. 9. A side of 700 opposite the side 730, not viewable, would typically have analogous features, as mirror images.

Still referring to FIG. 33, cartridge 700 includes a first member 740 of a projection/receiver arrangement 741, FIG. 39. The first member 740 of the projection/receiver arrangement 741, is positioned on frame piece 710, typically as an integral part thereof. A second member 742, FIG. 39, would be positioned as part of an associated housing, as discussed below. For the example shown, the first member 740 of the projection receiver arrangement 741 comprises at least one, and in the example shown two, projection members 745. Further regarding the function operation of the projection members 745, and in particular as part of the projection/receiver arrangement 741 is discussed below, in part in connection with FIG. 39.

Attention is now directed to FIG. 34, a side elevational view of cartridge 700. The cartridge 700 includes opposite sides 730, 731, and opposite curved ends 732, 733. In a typical example, the oval shaped media pack 701 has a racetrack shape, with central portions of sides 730, 731 extending generally parallel to one another, and with curved ends 732, 733 being generally semicircular and opposite one another.

Referring to FIG. 34, frame member 710 is viewable with band 711 thereon. Handle member 714 on end section 713 is viewable. Although alternatives are possible, typically band 710 comprises a single integral molded plastic unit having the features characterized molded integral therewith. After formation, the band 710 would then be adhesively secured to a media pack 701 at the location indicated, i.e., over and around the inlet end 702.

Referring to FIG. 34, it is noted that opposite sides 730, 731 of the cartridge 700 each include a first member 740 of a projection receiver arrangement 741 thereon. In the particular example shown, opposite sides 748, 749 of the frame member 710 are generally identical, being oriented as mirror images of one another.

In FIG. 35, an end elevational view of cartridge 700 is depicted. In FIG. 35, the view is taken toward outlet end 703 of the media pack 701. Referring to FIG. 35, the general shape of media pack 701 is shown having: opposite sides 730, 731, with central sections generally parallel to one another; and, opposite semicircular curved end sections 732, 733, forming an oval (in this instance racetrack) shape. Extending across outlet face 733, frame structure 755 is provided, as a grid work. The frame structure 755 can be formed integral with a support member 756 discussed below in connection with FIG. 38, supporting seal 708 during installation.

Handle member 714 is viewable in FIG. 35, comprising opposite finger receivers 714 a, 714 b, underneath outer cover members 714 c and 714 d respectively.

Still referring to FIG. 35, for the example shown each of opposite sides 748, 749 of the cartridge 700 includes identical, oppositely mounted, first members 740 of a projection/receiver arrangement 741. For the example shown, cartridge 700 includes: projection arrangement 745 a on one side 730 of the media pack 700; and, projection arrangement 745 b on opposite side 731.

Attention is now directed to FIG. 36, an end elevational view of cartridge 700 taken toward inlet end 702, FIG. 33. Frame member 710 includes rim 720 extending over and projecting outwardly from end 702 of media pack 701. Cross brace arrangement 725 extends across face 702, to provide strength and rigidity to the structure.

Attention is directed now to FIG. 37, in which a portion of air cleaner housing 770 is depicted in cross-section. The air cleaner housing 770 is sized and configured to receive cartridge 700 therein, when installed. The housing 770 is viewed in cross-section, and such that an access cover, analogous to cover 206, FIG. 7 is not viewable. The access cover will be discussed further in detail below. Housing 700 includes inlet or inlet section 771, outlet or outlet section 772, and central or cartridge receiver section 773. The inlet section 771 includes air flow inlet aperture 775 therein. In the example shown, the inlet section 771 is sized and configured to be secured to central section 773, for example by mechanical fit with a welded joint therebetween, although a plurality of alternate arrangements are possible. Typically each of sections 771, 772 and 773 will be formed from a molded plastic, although alternatives are possible. Section 771 may be constructed analogous to section 202, FIG. 26, or with a variety of alternatives discussed previously. Inlet aperture 775 is oriented to be directed toward a selected side, although it is noted that alternate directions of the inlet aperture 775 are possible, as discussed previously herein for other examples.

For the particular housing 775 depicted, cartridge 700 is sized and configured to be positioned in sealing engagement with annular seal surface 780. Further, cartridge 700 is sized to be installed with inlet end 702 oriented with frame piece 710 in sliding engagement, to the extent desired, with slide ramp 781. Housing central section 773 also includes central ramp arrangement 785 analogous to ramp arrangement 237, FIG. 20, sized and positioned for installation of cartridge 350, FIGS. 18 and 19, if desired.

Still referring to FIG. 37, outlet section 772 includes outlet air flow aperture 788 therein. As discussed previously, outlet aperture 788 can be provided directed in a variety of directions, depending on the particular system for installation involved. This was discussed above in connection with other figures. Although alternatives are possible, in typical arrangements outlet section 772 will be preformed and then secured to central section 773, for example by mechanical fit without welding. Typically section 772 will be formed from a molded plastic, although alternatives are possible.

Still referring to FIG. 37, housing 770 includes mounting pads 789 thereon, for secure engagement with a portion of equipment on which an air cleaner comprising the housing 770 is mounted, during use. In a typical example, pads 789 are sized, positioned and oriented to engage appropriate portions of an engine mount, during installation under a hood. However, a variety of alternatives are possible.

In some arrangements, the inlet aperture 775 can be fitted with an adapter, not shown, to facilitate engagement with an air flow inlet conduit arrangement, when housing 770 is mounted under the hood of a truck.

In FIG. 38 an air cleaner 800 is schematically depicted comprising housing 770 with cartridge 700 installed. In FIG. 38, the view is a cross-section analogous to the view of FIG. 37.

Referring to FIG. 38, attention is first directed to engagement between housing seal member 708 on cartridge 700 (adjacent outlet end or face 703), with annular seal-surface or member 780 on housing 770. Engagement is through an outwardly directed radial seal arrangement, analogous to that described for previous embodiments, see for example FIG. 16. An enlarged fragmentary view of the engagement is shown in FIG. 41. Referring to FIG. 41 differences for the arrangement of FIGS. 38 and 41, relative to FIG. 16, relate to the nature and position of housing annular seal surface 780, which comprises a flange member 780 a projecting axially into an interior 770 i of housing 770, spaced from outer wall 770 o, by unshaped receiver section 770 u. Receiver section 770 u is sized and positioned as an annulus region to receive air flow from a first annulus 770 a around cartridge 700 therein, during use. This receipt is typically directly from the first annulus; i.e., without a requirement that the air first pass through the media pack 701. In addition, portion 780 i of member 780 a extends beyond housing seal arrangement 707. As a result of the structure shown, air flow will pass member 770 a on opposite sides thereof (at base region 780 b, where flange 780 a engages a remainder of housing 770), except where engaged with housing seal member 708 in use. This will help tend to cool member 780 a in housing seal arrangement 707. This air cooling effect will facilitate the thermal stability of seal member 708, which typically comprises foamed polyurethane as previously described. This feature is particularly useful, when the air cleaner 800 is mounted under the hood of a vehicle, during use, where heat buildup can be substantial.

Thus, an improvement over the arrangements of FIG. 16, is that air cleaner 800 (of which housing 770 is a component) includes an annular seal arrangement 780 comprising a projection 780 a extending into an interior 770 i of housing 770, toward inlet section 771 with: an outer surface 780 o positioned to define an annulus region to receive air flow from an annular region 770 a of housing 770, between the housing outer wall 770 o and the cartridge 700. This air flow will help cool annular seal support 780 in a region where a seal is formed with outer annular housing seal arrangement 708.

Still referring to FIG. 41, an air flow outlet end 703 media pack 701 is shown having frame piece 810 thereon comprising cross-brace structure 755 and a seal support 811. The seal support 811 includes projection member 812 oriented for positioning of housing seal member 708 between the support 812 and the annular seal member 780. Support 811 supports the extension or support 812 in an appropriate orientation. Such a seal arrangement is generally described in PCT Publication WO 05/63361, published Jul. 14, 2005, incorporated herein by reference.

Referring to FIG. 38, when a relatively long cartridge 700 is positioned within housing 770, during dust loading undesirable stress or strain at region 840 of media pack 700, where engagement and housing seal arrangement 707 occurs, can be a problem. That is: (a) under dust load, substantial weight increase in media pack 701 can occur, for example two to four times filter cartridge weight increase, from dust load; and, (b) under conditions of typical use, for example as a vehicle air cleaner, substantial vibration and shock occurs. Thus, with a relatively long media pack 701 movement adjacent end 703, as a result of cantilevered mounting of the cartridge 700 at seal member 708, can lead to damage or loss of media pack integrity. The problem is exacerbated, as mentioned, with a relatively long media pack 701, i.e., typically a media pack 701 having a length, between opposite inlet and outlet surfaces 702, 703, and the order of at least 230 mm or more.

To inhibit damage to the media pack 701, and thus cartridge 700 integrity, with relatively long media packs 701, a media support arrangement is typically provided in a region adjacent to (i.e. at or slightly spaced from inlet end 702; typically within 50 mm of, and usually within 30 mm of, inlet end 702. A support arrangement at this location, is configured to provide engagement between the cartridge 700 and the housing 770, so that the cartridge 702 is supported against unacceptable levels of movement at end 702.

An example of such an arrangement is provided in the arrangement of FIGS. 33-41. In the arrangement of FIGS. 33-41, improvement of such a support arrangement is provided, by implementing at least one projection/receiver arrangement 741 with certain advantageous features.

For an understanding of this, attention is first directed to FIG. 39.

Referring to FIG. 39, an enlarged fragmentary cross-sectional view of air cleaner 800 is depicted, taken along line 39-39, FIG. 38, and with an access cover 825 in place. The fragmentary cross-sectional view of air cleaner 800 depicted in FIG. 39 is taken through a portion of projection/receiver arrangement 741, in particular through projection arrangement 745 b, FIG. 36 and directed downwardly, so that engagement with the housing 770 can be understood.

Referring to FIG. 39, then, the inlet section 771 (which is not viewable, see FIG. 37), would be mounted at 820, and the outlet section 772, not shown, see FIG. 37, would be mounted at region 821. At 825 the access cover is viewable. The access cover 825 would be generally analogous to cover 206, FIG. 8, and be removable from a remainder of housing section 773.

Still referring to FIG. 39, double headed arrow 745 b, indicates a member of projection/receiver arrangement 741, mounted on the cartridge 700. In particular, double headed arrow 745 b indicates projections or projection members 827, 828. Orientation of projections 827, 828 is shown in FIG. 35. It is noted that projection members 827 a, 828 a, FIG. 33, are analogous members to projection members 827, 828 but on an opposite side 730 of the cartridge 700.

Referring again to FIG. 39, double headed arrow 830 indicates a second member of the projection/receiver arrangement 741; arrows 830 indicating two spaced receiver members 831, 832 respectively. Second member 830, in this example comprising receiver members 831, 832, are positioned in housing 770, in particular cartridge receiver section 773, at an appropriate location for engagement with the first member 745 b of the projection/receiver arrangement 741. Typically housing section 773 is a molded plastic component, with second member 830 of the projection/receiver arrangement 741 molded integrally therewith.

Referring still to FIG. 39, during installation with cover 825 removed, the cartridge 700, FIG. 33, is installed, for example with some sliding engagement of end piece 710 with ramp 781. As the cartridge 700 is then pivoted or tipped into the sealing position, FIG. 38, projection member 827 will pivot or tip into its final position for installation engagement with receiver 831; and, projection member 828 will pivot or tip into its final position for installation engagement with receiver 832. In the example shown, member 827 also includes projection tip 837 thereon. Tip 837 is oriented to project toward access cover 825 when installed.

Attention is now directed to FIG. 40, an enlarged fragmentary view of a portion of FIG. 39, in particular a portion in which the part of projection/receiver arrangement 741 which comprises projection 827 and receiver 831 is depicted. Access cover 825 includes receiver pocket or indent 830 therein, including side 839. Receiver indent 830 and side 839 are positioned as structure to engage (in this instance receive) tip 837 on side portion 831 a of receiver 831 therein, when access cover 825 is secured in place, and to prevent the cartridge 700 from pivoting or tipping away from sealing; i.e. to prevent projection 827 from pivoting away from installation engagement with receiver 831. Tip 837 is positioned to be engaged between portion 831 a and side 839. Thus, cover 825 prevents projection member 827, and as a result the corresponding cartridge 700, from moving (tipping or pivoting) in the direction of arrow 840 and out of installation engagement once installed. Further, receipt of projection 827 within receiver 831, and projection 828 within receiver 832, will inhibit movement of the cartridge 700 adjacent end 702, beyond an acceptable amount and/or out of installation engagement. It is noted that the access cover 825 can include analogous structure positioned at an opposite side of cartridge 700, to analogously engage an opposite or second projection/receiver arrangement.

Still referring to FIG. 40, in the example shown, receiver 831 has a pocket shape between side walls or side wall sections, which will receive projection 827 in the example shown, in a manner supporting the projection 827 on both a side 827 a directed toward curved side end 732 of cartridge 700, FIG. 33; and, supporting side 827 b, directed toward a curved side end 733 of cartridge 700, FIG. 33, i.e., in a direction across, but not perpendicular to, a flow direction between end faces 702, 703 or inlet and outlet sections, 771, 772, (and not parallel (non-parallel) to flow faces 702, 703). This support will help inhibit unintended motion of cartridge 700, with end housing 770. Thus, the example receiver 831 has at least two, non-parallel, side wall sections, defining a receiver or pocket therebetween.

To facilitate the support, both the projection 827 and receiver 831, for the example shown, provided with a generally “v” or “checkmark” shape, FIG. 40, with at least two diverging (non-parallel) side wall sections and, in the example shown, with a vertex present and a point of the vertex between sides directed toward an outlet portion 772 of the air cleaner 800; and, away from the inlet portion 771 of the air cleaner 800, FIG. 38. Referring again to FIG. 40, to accomplish this projection 827 is provided with sides 827 a, 827 b that in the example engage one another at vertex 827 c, although alternatives are possible. Also receiver 831 is provided with sides 831 a, 831 b diverging from one another (and in the example shown engaging at vertex 831 c,) although alternatives are possible.

For the particular example shown, side 827 a of projection 827, and side 831 a receiver 831, extend in a direction nearly parallel to a direction of extension between inlet section 771 and outlet section 772, FIG. 38. Also, side 827 b and side 831 b extend at an angle relative to the corresponding sides 821 a, 831 a, typically within the range of about 35° to 55°, although alternatives are possible. In FIG. 33, the angle between sides 827 a, 827 b is indicated at x; and in FIG. 40, the angle between sides 831 a and 831 b is indicated at y. Thus, sides 827 b and 831 b extend in a direction across a direction between inlet and outlet faces (702, 703) of the cartridge 700; in the example shown the extension being at an angle non-perpendicular to this direction.

At region 831 a receiver 831 can be provided with an aperture arrangement or similar arrangement, to allow for dust passage therethrough, as projection 827 is pushed into receiver 831, during cartridge 700 installation.

In more general terms, for the projection/receiver arrangement 741 depicted in FIG. 40 a first member, (for example a projection member 827) is positioned on the cartridge 700; and a second member, (for example receiver member 831), is positioned on the housing 770. The two are oriented such that during a pivoting of the cartridge 700 into sealing or installation position, the projection member 827 engages the receiver member 831 for secure holding of the cartridge 700 in position, when the cover 825 is installed. This is accomplished by defining a projection/receiver arrangement in which the first member, i.e., projection member 827, is supported by the second member, i.e., receiver member 831. This is provided in the example of FIG. 40, by utilizing a first v-shaped projection 827 and a second v-shaped receiver 828, the second sized to receive the first in a supporting fashion.

For the particular example shown, projection 827 and receiver 828 are oriented with open ends 827 e, 828 e (i.e. ends of, or direction of, divergence for the sidewalls) directed toward the inlet end face 702 of the cartridge 700 and the inlet end 771 of the housing 770 respectively; and, with the vertices 827 c, 831 c (i.e., ends of, or direction of, convergence of the sidewalls) thereof directed toward the outlet end 203 of the cartridge 700 and the outlet end 72 of the housing 770 respectively.

In addition, the member of the projection/receiver arrangement 741 mounted on the cartridge 700, in this instance projection member 827, is provided with a tip 837 that is positioned between the receiver 831 and a portion 839 of the cover 825 when the cartridge 700 is in the installation (or installed) position. For the particular arrangement 741 depicted, tip 837 is positioned on a first side wall of the projection arrangement 741 and projects toward curved side end 732 of cartridge 700 (and away from a second side wall of the projection member 827) and is pinched between cover 825 and receiver 831, to secure projection member 827, and thus cartridge 700 in place at installation. Still referring to FIG. 39, the portion of the projection/receiver arrangement 741 comprising projection member 827 and receiver member 831 will sometimes be referred to herein as a projection/receiver couple 741 a.

Referring to FIG. 39, it is noted that projection/receiver arrangement 741 includes a second projection/receiver couple 741 b, spaced from couple 741 a along side 731 of cartridge 700. This will provide further stabilization. Couple 741 comprises a projection/receiver arrangement including projection member 828 and receiver member 832, for the example shown each having a “v” or “check” shape with opposite sides. Thus, receiver 832 has sides 832 a and 832 c around central vertex 832 b; and, projection 828 comprises sides 828 a, 828 c around central vertex 828 b.

It will be understood from the figures that for a typical preferred securing engagement between and among: cartridge 700; cover 825; and, a remainder of housing 700; at least two and typically four couples are provided, two positioned on each side of the cartridge 700, the opposite sides being mirror images.

From FIGS. 33-41, then, and above characterizations above regarding them, general principles and observations in accord with the following will be understood. In one aspect, an air cleaner is provide with a housing having a primary filter cartridge housing radial seal surface comprising an interior flange projecting toward an air flow inlet section of the housing. The flange can be configured to define an air flow annulus section or region therearound, within the housing interior and in flow communication with a first air flow annulus around a filter cartridge received within the housing, between the filter cartridge and a housing side wall. In a typical application, the interior flange would have a length of at least 20 mm, typically within the range of 25-35 mm, inclusive and typically not more than 40 mm, and would be typically at least 2.5 mm thick, usually 2.5-4.5 mm thick, inclusive, and typically not more than 5 mm. Also, in some applications the interior flange would have a base end portion directed radially interiorly, with an extension of at least 3 mm, typically 3-7 mm inclusive and typically not more than 7 mm not covered by a filter cartridge housing seal member, when the filter cartridge is installed.

The interior flange projecting toward the air flow inlet section can be provided in the housing whether the housing is configured for alternatively receiving two different lengths of filter cartridge, or otherwise.

In another or second aspect, an air cleaner assembly is provided including: a housing defining an interior having an air flow inlet section and air flow outlet section; a primary filter cartridge receiving section between the air flow inlet section and the air flow outlet section; and, a primary filter cartridge housing radial seal surface. The radial seal surface may or may not be defined with the interior flange previously discussed. The housing may be configured for possible receipt of only one length (or more than one length) of filter cartridge, as a matter of choice.

In this other or second aspect, a first removable and replaceable primary filter cartridge is positioned within the housing. The primary filter cartridge comprises a media pack having an inlet flow face and an opposite outlet flow face. The media pack typically comprises a plurality of flutes extending between the inlet flow face and the opposite outlet flow face. The media pack is closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face. By this it is meant that the air must be filtered, if it enters the inlet flow face and exits the outlet flow face, by passage through the media. The primary filter cartridge includes a housing seal member thereon. In an example shown, the housing seal member is provided with a radial seal portion, member or surface in radial seal engagement with the primary filter cartridge housing radial seal surface.

In this other or second aspect, the air cleaner further includes a first projection/receiver arrangement. The first projection/receiver arrangement includes a first receiver member secured to an interior wall of the housing. It typically includes at least first and second (typically non-parallel) side wall sections defining a receiver space therebetween. A first projection member is positioned on the first removable and replaceable primary filter cartridge. It is oriented with at least a portion thereof within the receiver space between the first and second side wall sections of the first receiver member.

In an example shown, the first and second side wall sections of the first receiver member are not parallel to one another; and, for example, diverge from one another in extension, for example in extension toward the inlet of the air cleaner. By doing so, they form a pocket or receiver into which the first projection member can tip, or from which it can tip, during installation or removal of the primary filter cartridge. The access cover can be provided within structure, for example a pocket, recess or shoulder arrangement, that inhibits tipping out of receipt within the receiver or pocket, when the access cover is installed.

In an example described, the first projection member includes first and second side wall sections non-parallel to one another (i.e., diverging from one another), for example in extension toward the inlet flow face of the first removable and replaceable primary filter cartridge.

In an example, the first projection member includes a locking tip thereon directed toward the access cover; the locking tip being positioned between the first receiver member and the inlet flow face of the filter cartridge. Further, in this example, the access cover includes a first receiver pocket oriented with a first locking tip of the first projection member (of the first projection/receiver arrangement) directed therein, when the access cover is in place. As a result, the first receiver pocket of the access cover includes a locking shoulder securing the first locking tip from tipping away from the first receiver member of the first projection/receiver arrangement. The access cover can include pockets or other structure at opposite sides of the cartridge, for such engagement.

Although a variety of alternatives are possible, in an example shown the filter cartridge has first and second opposite sides and first and second opposite curved ends; and, the first projection member is positioned on a first side of the cartridge.

In an example described, a second projection/receiver arrangement is provided in the air cleaner, with a first receiver member thereon secured to an interior wall of the housing opposite the first receiver member of the first projection/receiver arrangement and with the first removable and replaceable filter cartridge therebetween. The first member of the second projection/receiver arrangement comprises at least first and second side wall sections non-parallel to one another, typically diverging from one another to form a receiver or pocket, for example diverging from one another in extension toward the inlet section; and, a first projection member of the second projection/receiver arrangement is positioned on the first removable and replaceable primary filter cartridge and oriented with at least a portion thereof within the receiver or pocket between the first and second side wall sections of the first receiver member of the second projection/receiver arrangement.

The second projection/receiver arrangement can include a tip, for engagement by structure in the access cover, analogous to the tip described for the first projection/receiver arrangement.

Also described are filter cartridges having features in general in accord with those characterized above for an air cleaner. For example, the filter cartridge may comprise a media pack having an inlet flow face and an opposite outlet flow face, and comprising a plurality of flutes extending between the inlet flow face and the opposite outlet flow face. The media pack would generally be closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face. A seal member is mounted on the media pack adjacent the outlet flow face and including, in an example shown, radially outwardly directed radial seal member or surface.

A preform support is positioned on the media pack adjacent the inlet flow face, the preform support including a first member of a projection/receiver arrangement thereon, the first member including at least first projection member having a least first and second side wall sections typically non-parallel, i.e. diverging from one another, in an example shown in extension toward the inlet flow face.

Typically the first member of the first projection/receiver arrangement is positioned on the media pack at a location within 50 mm of the inlet flow face.

In still another general statement, a filter cartridge is provided which comprises a media pack as characterized, and a seal member as characterized. A first member of the first projection/receiver arrangement is positioned on the media pack within a location of about 50 mm, typically within 30 mm, of the inlet flow face. The first member includes a first projection member extending outwardly from adjacent the media pack and including at least one of: a first projection wall segment that is directed generally between the inlet face and the outlet flow face; and, a second projection wall segment with a portion directed generally across a direction between the inlet flow face and the outlet flow face. In the specific example shown, the first member of the first projection member includes both. However there is no specific requirement that in all applications of the techniques described herein, both are present, as long as a secure installation position is achievable. Of course a first projection member of a second projection receiver arrangement can be mounted on an opposite side of the filter cartridge.

Referring to FIG. 40, for the projection/receiver arrangement shown, the receiver member 827 includes a first side 827 a directed generally between the inlet flow face and the outlet flow face of the filter cartridge. Also, a second wall section 827 b is depicted, which generally extends across a direction between the inlet flow face and the outlet flow face, in the example shown at an angle of less than 90°, as opposed to directly parallel to the two opposite flow faces. It will be understood from the example shown in FIG. 40, that both wall sections can be present. However some stabilization will occur if only one or the other of the wall sections is present. This will be understood from the general descriptions and functions provided previously.

A variety of features are described. Variations in them are possible; and, there is no requirement that an arrangement include all of the features described to have some advantage. 

1. An air cleaner assembly comprising: (a) a housing defining an interior and having: an air flow inlet section; an air flow outlet section; and, a primary filter cartridge receiving section between the air flow inlet section and the air flow outlet section; and, a primary filter cartridge housing radial seal surface; (b) a first removable and replaceable primary filter cartridge positioned within the housing; the first primary filter cartridge comprising a media pack having an inlet flow face and an opposite outlet flow face; (i) the media pack comprising a plurality of flutes extending between the inlet flow face and the opposite outlet flow face; (ii) the media pack being closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face; and, (iii) the primary filter cartridge including a housing seal member thereon in radial sealing engagement with the primary filter cartridge housing radial seal surface; (c) the housing defining a first air flow annulus around the first removable and replaceable primary filter cartridge; and, (d) the primary filter cartridge housing radial seal surface comprising an interior flange projecting toward the air flow inlet section; (i) the interior flange having inner and outer surfaces; (ii) the housing seal member being sealed to the interior surface of the interior flange; and, (iii) the interior flange defining an air flow annulus region therearound within the housing interior and in flow communication with the first air flow annulus.
 2. An air cleaner assembly according to claim 1 wherein: (a) the media pack comprises a fluted sheet secured to a facing sheet and coiled with the facing sheet directed outwardly.
 3. An air cleaner assembly according to claim 1 wherein: (a) the interior flange has a length of at least 20 mm and not more than 40 mm.
 4. An air cleaner assembly according to claim 3 wherein: (a) a portion of the interior flange to which the primary filter cartridge housing seal member is engaged, is no more than 5 thick.
 5. An air cleaner assembly according to claim 1 wherein: (a) the interior flange has an interior surface with a base portion of at least 3 mm not covered by the housing seal member.
 6. An air cleaner assembly according to claim 1 wherein: (a) the access cover includes a primary filter cartridge engagement and retainment arrangement thereon.
 7. An air cleaner assembly according to claim 6 wherein: (a) the primary filter cartridge engagement and retainment arrangement includes first and second, spaced, handle arrangement receivers in the access cover; (i) the first one of the handle arrangement receivers being positioned engaging a handle arrangement on the first primary filter cartridge positioned within the housing; and, (ii) the second one of the handle arrangement receivers being empty and positioned to receive a handle arrangement for an alternate sized cartridge to the first primary filter cartridge, when positioned within the housing instead of the first primary filter cartridge.
 8. An air cleaner assembly according to claim 7 wherein: (a) the primary filter cartridge engagement and retainment arrangement includes a projection in the access cover that projects into an interior of the housing; (i) the projection in the access cover being positioned to extend to a location adjacent a primary filter cartridge sized to be installed by engagement with the first primary filter cartridge biasing track.
 9. An air cleaner assembly according to claim 1 wherein: (a) the first removable and replaceable primary filter cartridge includes a first member of a first projection/receiver arrangement thereon; and, (b) the housing includes a first sidewall portion with a second member of the first projection/receiver arrangement thereon; (i) the second member of a first projection/receiver arrangement including a first receiver member including at least first and second, sidewall sections defining a receiver therebetween; (c) the first primary filter cartridge being positioned with: (i) the first member of the first projection/receiver arrangement engaged with the second member of the first projection/receiver arrangement; (A) the engagement between the first and second members of the projection/receiver arrangement including a portion of the first member positioned between the first and second sidewall sections of the first receiver member of the second member of the first projection/receiver arrangement; and, (B) the first primary filter cartridge being positioned such that when the access cover is removed, the first primary filter cartridge can be tipped into and out of installation engagement with the primary cartridge housing radial seal surface while concomitantly tipping a portion of the first member of the first projection/receiver arrangement away from a portion of the second member of the first projection/receiver arrangement.
 10. An air cleaner assembly according to claim 9 wherein: (a) the first primary filter cartridge includes a first member of a second projection/receiver arrangement thereon; (b) the housing includes a second sidewall portion with a second member of the second projection/receiver arrangement thereon; (i) the second member of a second projection/receiver arrangement including a first receiver member including at least first and second sidewall sections defining a receiver therebetween; (c) the first primary filter cartridge being positioned with: (i) the first member of the second projection/receiver arrangement including a first projection member engaged with the second member of the second projection/receiver arrangement; (A) the engagement between the first and second members of the second projection/receiver arrangement including at least a portion of the first projection member of the first member positioned between the first and second sidewall sections of the second member; and, (B) the first primary filter cartridge being positioned such that when the access cover is removed, the first primary filter cartridge can be tipped into and out of installation engagement with the housing radial seal surface while concomitantly tipping a portion of the first member of the second projection/receiver arrangement away from a portion of the second member of the second projection/receiver arrangement.
 11. An air cleaner assembly according to claim 10 wherein: (a) the first removable and replaceable primary filter cartridge includes first and second, opposite, sides and first and second, opposite, curved ends; (i) the first side including the first member of the first projection/receiver arrangement thereon; and, (ii) the second side including the first member of the second projection/receiver arrangement thereon.
 12. An air cleaner assembly according to claim 11 wherein: (a) the first member of the first projection/receiver arrangement includes at least a first projection member having first and second side wall sections oriented to diverge from one another; and, (b) the first member of the second projection/receiver arrangement includes at least a first projection member having first and second side wall members oriented to diverge from one another.
 13. An air cleaner assembly according to claim 12 wherein: (a) the first and second side wall sections of first projection member of the first projection/receiver arrangement diverge from one another in extension toward the inlet flow face; and (b) the first and second side wall sections of the first projection member of the second projection receiver arrangement diverge from one another in extension toward the inlet flow face.
 14. An air cleaner assembly according to claim 13 wherein: (a) the first member of the first projection/receiver arrangement includes a first locking tip directed toward the access cover and positioned adjacent the second member of the first projection/receiver arrangement between the second member of the first projection/receiver arrangement and the air flow inlet section of the housing; and, (b) the access cover includes a first receiver pocket oriented with the first locking tip of the first member of the first projection/receiver arrangement directed therein; (i) the first receiver pocket of the access cover including a locking shoulder securing the first locking tip of the first member of the first projection/receiver arrangement from tipping away from the second member of the first projection/receiver arrangement when the access cover is installed on a remainder of the housing.
 15. An air cleaner assembly comprising: (a) a housing having an access cover and defining an interior and having: an air flow inlet section; an air flow outlet section; a primary filter cartridge receiving section between the air flow inlet section and the air flow outlet section; and, a primary filter cartridge radial seal surface; (b) a filter removable and replaceable primary filter cartridge positioned within the housing; the primary filter cartridge comprising a media pack having an inlet flow face and an opposite outlet flow face; (i) the media pack comprising a plurality of flutes extending between the inlet flow face and the opposite, outlet flow face; (ii) the media pack being closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face; and, (iii) the primary filter cartridge including a housing seal member thereon in radial sealing engagement with the primary cartridge housing radial seal surface; and, (c) a first projection/receiver arrangement including: (i) a first receiver member secured to an interior wall of the housing having at least first and second sidewall sections defining a receiver space therebetween; and, (ii) a first projection member positioned on the first removable and replaceable primary filter cartridge and oriented with at least a portion thereof within the receiver space between the first and second wall sections of the first receiver member.
 16. An air cleaner assembly according to claim 15 wherein: (a) the first and second sidewall sections of the first receiver member are not parallel to one another.
 17. An air cleaner assembly according to claim 16 wherein: (a) the first projection member has a v-shape with a vertex directed toward the outlet flow face of the filter cartridge; and, (b) the first and second side wall sections of the first receiver member diverge from one another in extension toward the inlet section of the housing.
 18. An air filter cartridge comprising: (a) a media pack having an inlet flow face and an opposite outlet flow face; (i) the media pack comprising a coiled arrangement comprising a facing sheet secured to a fluted sheet to form a plurality of flutes extending between the inlet flow face and the opposite outlet flow face; (ii) the media pack being closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face; and, (iii) the media pack being first and second, opposite, sides and first and second, opposite, curved ends; (b) a seal member mounted on the media pack adjacent the outlet flow face and including a radially outwardly directed radial seal surface; and (c) a preform support positioned on the media pack adjacent the inlet flow face; (i) the preform support including a first member of a projection/receiver arrangement thereon; the first member including a first projection member including first and second sidewall sections having portions non-parallel and diverging from one another.
 19. An air filter cartridge comprising: (a) a media pack having an inlet flow face and an opposite outlet flow face and an oval perimeter shape with first and second opposite straight sides and first and second, opposite, curved ends; (i) the media pack comprising a plurality of flutes extending between the inlet flow face and the outlet flow face; and, (ii) the media pack being closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face; (b) a seal member positioned on the media pack including a radially outwardly directed radial seal surface; and, (c) a first member of a first projection/receiver arrangement positioned on the media pack at a location within 50 mm of the inlet flow face; (i) the first member including a first projection member extending outwardly from adjacent the media pack and including at least one of: (A) a first projection wall segment directed generally between the inlet flow face and the outlet flow face; and, (B) a second projection wall segment with a portion directed generally across a direction between the inlet flow face and the outlet flow face and non-parallel to both of the inlet flow face and the outlet flow face. 